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': 'Therapeutic index of a drug is an indicator of its- \nSelect and explain. \nA. Potency, B. Safety, C. Toxicity, D. Efficacy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b\' i.e., Safety "Therapeutic index is the ratio between the toxic dose and the therapeutic dose of a drug, and is used as a measure of the relative safety of the drug for a paicular treatment."', 'role': 'assistant'}]