Which of the following represents composite supply

Composite supply is a supply of goods or services in which the principal supply is inseparable from one or more ancillary supplies. The principal supply is the supply that is essential to the nature of the composite supply. The ancillary supplies are the supplies that are naturally bundled with the principal supply and are provided in conjunction with it in the ordinary course of business. In the case of doctor's service with medicines, the doctor's service is the principal supply. The medicines are the ancillary supply. The medicines are naturally bundled with the doctor's service because they are necessary for the doctor to provide treatment to the patient.