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': 'At Primary Health Centre (PHC) level, vaccines Are stored in the - \nSelect and explain. \nA. Cold box, B. Deep freezer, C. Ice lined refrigerator, D. Walk in cold room', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]