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': 'Which is not a criteria for overcrowding ? \nSelect and explain. \nA. No. of persons, B. Sex separation, C. Door and window, D. Floor space', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Door and window", 'role': 'assistant'}]