This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
[{'content': 'Kanawati index is - \nSelect and explain. \nA. Height\\/ head circumference, B. Mid arm circumference\\/ Head circumference, C. Weight\\/ Height, D. Abdominal circumferece\\/ Head circumference', 'role': 'user'}, {'content': 'Answer: B \nExplanation: KANAWATI INDEX;- Mid arm circumference divided by head circumference. 1. Normal : > 0.31 2. Mild PEM: 0.31-0.28 3. ModeratePEM: 0.28-0.25 4. Severe PEM : <0.25', 'role': 'assistant'}]