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      Question

      What is the main cause of

      emphysema?  
      A Smoking Correct Answer Incorrect Answer
      B Obesity Correct Answer Incorrect Answer
      C High cholesterol Correct Answer Incorrect Answer
      D Lack of exercise Correct Answer Incorrect Answer

      Solution

      Smoking damages the air sacs in the lungs, leading to emphysema, a type of chronic obstructive pulmonary disease (COPD).

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