This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'All are true statements among the following, except \nSelect and explain. \nA. BCG, measles vaccines are censitive to light, B. Hep. B vaccine sensitive to freezing, C. Polio vaccine most sensitive to heat, D. Tetanus vaccine most heat sensitive', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Among the vaccines, polio is the most sensitive to heat, requiring storage at minus 20 degree C. Vaccines which must be stored in the freezer compament are : polio and measles. Vaccines which must be stored in the COLD PA but never allowed to freeze are : "T series" vaccines (DPT, tetanus toxoid, DT) hepatitis B, BCG, and diluents. Ref : Park 23rd edition Pgno : 109', 'role': 'assistant'}]