This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Social & Preventive Medicine
[{'content': 'At a PHC, vaccine storage is done in \nSelect and explain. \nA. Vaccine carrier, B. ILR, C. Walk in Cold rooms, D. Cold box', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - At PHC level vaccine is stored in small ILR & small deep freezer ILR Cold chain components & level in India 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'}]