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: Pediatrics
[{'content': 'Best index for chronic malnutrition is: September 2010 \nSelect and explain. \nA. Height for age, B. Weight for age, C. Weight for height, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Height for age', 'role': 'assistant'}]