This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Efficacy of the drug refers to \nSelect and explain. \nA. Affinity of the drug to bind to the receptor, B. Affinity of the drug that binds to the receptor and activates it, C. Dose that required to to produce response, D. Maximum response a drug can produce', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Efficacy means effectiveness, i.e. the ability of something, e.g. a medicine, to produce the results you want Ref-KDT 7/e p54', 'role': 'assistant'}]