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': 'Floor space of 2 persons – \nSelect and explain. \nA. 70–90 sq.ft, B. 90–100 sq.ft, C. 50–70 sq.ft, D. 110–120 sq.ft', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]