This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Regarding efficacy and potency of a drug, all are true, EXCEPT: \nSelect and explain. \nA. In a clinical setup, efficacy is more impoant than potency, B. In the log dose response curve, the height of the curve corresponds with efficacy, C. ED50 of the drug corresponds to efficacy, D. Drugs that produce a similar pharmacological effect can have different levels of efficacy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ED50 refers to Effective Dose of a drug needed to produce a paicular response in 50% of population. It is a quantitative measure of the potency of a drug. Smaller the ED50 value, more potent is the drug. Ref : K.D TRIPATHI 8th ed', 'role': 'assistant'}]