This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
[{'content': 'Therapeutic index is measure of: \nSelect and explain. \nA. Safety, B. Efficacy, C. Potency, D. Selectivity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) Safety(Ref: KDT 8th/65)Therapeutic Index (TI)It is a measure of the safety of a drug.It is calculated as a ratio of LD50 to ED50.Drugs having high TI are safer whereas those having low TI are more likely to be toxic.', 'role': 'assistant'}]