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

Not all drugs are considered medicines because "medicines are used to cure, treat, and prevent diseases".

Medicines are chemicals or compounds which are used to fix, end, or avert sickness; ease manifestations; or help in the analysis of ailments. Advances in prescriptions have empowered specialists to fix numerous maladies and spare lives.  

Nowadays, medicines originate from an assortment of sources. Many were created from substances found in nature, and even today many are separated from plants.  

Medicines act in a variety of ways. Some can fix a disease by murdering or ending the spread of attacking germs, for example, microbes and infections. Others are utilized to regard disease by executing cells as they separate or keeping them from increasing.

The answer is c

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this is true my friend.