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Introduction:
A prescription is an essential component of healthcare that allows medical professionals to provide specific instructions for a patient’s medication. In this context, it is crucial for medical college students to have a comprehensive understanding of the roles and responsibilities of different healthcare professionals involved in prescribing medications. This will help them in their future practice to ensure safe and effective patient care.

Answer:
D. doctor.

Explanation:
A prescription is an order for medication written by a doctor. Doctors possess the necessary knowledge and expertise to diagnose medical conditions, assess patient needs, and determine the appropriate medications and dosages. By writing prescriptions, doctors play a critical role in initiating and managing patients’ healthcare treatments. Other healthcare professionals, such as medical assistants, nurses, and pharmacists, may assist in various aspects of the medication administration process, but the authority to prescribe medications lies with doctors.