This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacodynamics, Subject name: Pharmacology
[{'content': 'Calculate the therapeutic index of the drug from given DRC. \nSelect and explain. \nA. 8, B. 21, C. 128, D. 1024', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Therapeutic index is calculated as: TI = LD50/ED50 TI = 128 mg/6 mg = 21.3', 'role': 'assistant'}]