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': "The effective temperature of 'comfo zone is'? \nSelect and explain. \nA. 69-76deg F, B. 77-80deg, C. 83-85deg F, D. 86-90deg F", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e. 77-80deg F", 'role': 'assistant'}]