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': 'The risk of cold chain failure is greatest at:- \nSelect and explain. \nA. Regional level, B. District Level, C. PHC level, D. Subcentre & village level', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The risk of cold chain failure is greatest at Subcentre & village level. Cold chain maintainence occurs at 5 major levels in India 1.Regional/ State - WIC, WIF 2. District - ILR , DF 3. PHC - ILR , DF (small in size) 4. Sub center - vaccine carrier 5. Village - Ice pack All vaccine Transpo in India at Temp. of +2 to + 8degC', 'role': 'assistant'}]