Question

not all drugs are considered medicines because ______. a. they are chemically different substances b. the government defines drugs and medicines separately c. medicines are used to cure, treat, and prevent diseases d. drugs cannot be purchased in pharmacies

Explanation:

1. Option A is incorrect: Many drugs and medicines share similar chemical structures, this is not the defining difference.
2. Option B is incorrect: The government classification follows the functional difference, it is not the root reason.
3. Option D is incorrect: Many prescription and over-the-counter drugs (that are medicines) are sold in pharmacies.
4. Option C is correct: Medicines have a defined therapeutic purpose to cure, treat, or prevent illness, while not all drugs serve this function (such as recreational drugs with no medical use).

Answer:

C. medicines are used to cure, treat, and prevent diseases