What is an example of a drug source derived from living organisms?

Plants serve as a key example of a drug source derived from living organisms because they naturally produce various chemical compounds that can have therapeutic effects. Many medications are derived from plant materials, including both the plant itself and the active compounds that can be extracted from it. For instance, aspirin originated from the bark of the willow tree, while morphine is derived from opium poppies.

In contrast, options such as minerals refer to inorganic substances, which do not come from living organisms. Synthetic compounds are entirely man-made and do not have a biological source. Water, while essential for life, is not a drug source and does not originate from or serve as a therapeutic agent derived from living organisms. Understanding these distinctions is crucial for recognizing the origins of various medications and their classifications in pharmacology.