Which statement about graded responses is true?

• A. True
• B. False
• C. Cannot be determined
• D. Depends on drug class

Answer: (A)

Graded responses describe a continuous, dose-dependent change in effect. In pharmacodynamics, many drug effects can be measured on a scale and increase gradually with higher doses until a maximal effect is reached. This is captured by the dose–response curve, which helps quantify potency (EC50) and efficacy (Emax). Because this continuous relationship is a real and common aspect of how drugs act, the statement is true. The other options don’t fit as well because graded responses are a well-established concept across many drugs, and deciding this isn’t generally limited to a specific drug class or left indeterminate.