Which of the following statements regarding receptor sites of medications is TRUE?
A) An agonist is a drug that binds to receptor sites and prevents a normal response by the cell.
B) An antagonist is a drug that binds to a receptor and causes a response.
C) A protagonist is a drug that binds to a receptor and causes a response.
D) The stronger the attraction of a drug to a receptor site, the greater the affinity.
Answer: D
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