This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
[{'content': 'According to 1991 census family size is - \nSelect and explain. \nA. 2.4, B. 5.5, C. 4.4, D. 5.9', 'role': 'user'}, {'content': 'Answer: B \nExplanation: According to 1991 census average house hold size is 5.5. According to 2001 census it has declined to 5.3 Ref: Census of India, GOI', 'role': 'assistant'}]