A surgeon, aware that a specific operation is probable to result in the demise of Z, who is suffering from a painful ailment, proceeds to perform the operation on Z with the consent of Z, and without the intention of causing Z's death, but rather with the intention of benefitting Z in good faith. Here, A has committed no offence as per —

Solution

Section 88. Act not intended to cause death, done by consent in good faith for person's benefit.— Nothing, which is not intented to cause death, is an offence by reason of any harm which it may cause, or be intended by the doer to cause, or be known by the doer to be likely to cause, to any person for whose benefit it is done in good faith, and who has given a consent, whether express or implied, to suffer that harm, or to take the risk of that harm, Section 89. Act done in good faith for benefit of child or insane person, by or by consent of guardian.— Nothing which is done in good faith for the benefit of a person under twelve years of age, or of unsound mind, by or by consent, either express or implied, of the guardian or other person having lawful charge of that person, is an offence by reason of any harm which it may cause, or be intended by the doer to cause or be known by the doer to be likely to cause to that person: Provided— Provisos. First.—That this exception shall not extend to the intentional causing of death, or to the attempting to cause death; Secondly.—That this exception shall not extend to the doing of anything which the person doing it knows to be likely to cause death, for any purpose other than the preventing of death or grievous hurt, or the curing of any grievous disease or infirmity; Thirdly.—That this exception shall not extend to the voluntary causing of grievous hurt, or to the attempting to cause grievous hurt, unless it be for the purpose of preventing death or grievous hurt, or the curing of any grievous disease or infirmity; Fourthly.—That this exception shall not extend to the abetment of any offence, to the committing of which offence it would not extend. Consent known to be given under fear or misconception.—A consent is not such a consent as is intended by any section of this Code, if the consent is given by a person under fear of injury, or under a misconception of fact, and if the person doing the act knows, or has reason to believe, that the consent was given in consequence of such fear or misconception; or Consent of insane person.—if the consent is given by a person who, from unsoundness of mind, or intoxication, is unable to understand the nature and consequence of that to which he gives his consent; or Consent of child.—unless the contrary appears from the context, if the consent is given by a person who is under twelve years of age. Act done in good faith for benefit of a person without consent.—Nothing is an offence by reason of any harm which it may cause to a person for whose benefit it is done in good faith, even without that person's consent, if the circumstances are such that it is impossible for that person to signify consent, or if that person is incapable of giving consent, and has no guardian or other person in lawful charge of him from whom it is possible to obtain consent in time for the thing to be done with benefit: Provided— Provisos. First.—That this exception shall not extend to the intentional causing of death, or the attempting to cause death; Secondly.—That this exception shall not extend to the doing of anything which the person doing it knows to be likely to cause death, for any purpose other than the preventing of death or grievous hurt, or the curing of any grievous disease or infirmity; Thirdly.—That this exception shall not extend to the voluntary causing of hurt, or to the attempting to cause hurt, for any purpose other than the preventing of death or hurt; Fourthly.—That this exception shall not extend to the abetment of any offence, to the committing of which offence it would not extend.