This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'The maximum effect of a drug is defined by- \nSelect and explain. \nA. Therapeutic index, B. Potency, C. Efficacy, D. Adversity', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Efficacy - Refers to maximal response that can be produced by a drug. Potency - Amount of drug needed to produce a given response.", 'role': 'assistant'}]