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 ratio of the dose that produces toxicity to the dose that produces a clinically desired or effective response in a population of individual is known as: \nSelect and explain. \nA. Efficacy, B. Potency, C. Therapeutic index, D. Partial agonist', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]