This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cold Chain in India, Subject name: Social & Preventive Medicine
[{'content': 'Vaccine can be stored at PHC for:- \nSelect and explain. \nA. 2 day, B. 7 days, C. 15 days, D. 30 days', 'role': 'user'}, {'content': 'Answer: D \nExplanation: - Vaccine storage duration at PHC level is maximum of 1 month Storage of vaccines at different levels: STORAGE LEVEL STORAGE DEVICES DURATION OF STORAGE STATE/ REGIONAL LEVEL walk in cold rooms walk in freezer 3 months CHC/ DISTRICT LEVEL Large ILR Large deep freezer 1 month PHC Small ILR Small deep freezer 1 month SUBCENTER LEVEL Vaccine carriers 24-48hrs VILLAGE LEVEL Ice packs 2-4hrs', 'role': 'assistant'}]