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': 'Kanawati index is used for ? \nSelect and explain. \nA. Air population, B. PEM, C. Obesity definition, D. Infectivity', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., PEM Kanawati index is used to classify protein energy malnutrition (PEM).", 'role': 'assistant'}]