Final answer:
Each Class I Institution must have a qualified pharmacist, who dispenses medications prescribed by doctors and provides guidance on their use. Pharmacists require extensive knowledge in chemistry and biology and must be licensed to practice.
Step-by-step explanation:
The question seeks to identify which professional role a Class I Institution, such as drugstores, hospitals, and other medical facilities, must have. The correct answer is a qualified pharmacist. A pharmacist is an essential healthcare provider who dispenses drugs prescribed by a doctor. They must have extensive knowledge in both chemistry and biology to understand the pharmaceuticals' impacts on the human body. In the United States, becoming a pharmacist requires a completion of a four-year doctorate in pharmacy, followed by state licensure. Pharmacists also guide physicians on drug selection, dosage, interactions, and side effects and assist patients in the correct use of their medications. While pharmacists can work in various settings, their expertise in the sciences makes them indispensable in healthcare institutions.