This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'The therapeutic index of a drug is a measure of its \nSelect and explain. \nA. Safety, B. Potency, C. Efficacy, D. Dose variability', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Safety is indicated by TI.drug having a TI of more than 1 is considered to be safe when compared to drug having a TI of less trhan one which requies constant plasma monitoring. Ref: KDT 6/e pg 48.', 'role': 'assistant'}]