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: Anatomy
[{'content': 'A vaccine which requires stringent condition for storage is \nSelect and explain. \nA. DPT, B. OPV, C. BCG, D. TT', 'role': 'user'}, {'content': "Answer: B \nExplanation: (Refer: K. Park's Textbook of Preventive and Social medicine, 24thedition, pg no: 222)", 'role': 'assistant'}]