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: Social & Preventive Medicine
[{'content': 'Vaccine which must be stored in the freezer compartment of a fridge is/are -a)  BCGb)  OPVc)  Measlesd)  Smallpoxe)  All of the above \nSelect and explain. \nA. ce, B. bc, C. cde, D. eb', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]