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': 'Corpulence Index Normal valve \nSelect and explain. \nA. < 1.2, B. > 1.2, C. 2.2, D. < 0.2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]