This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
[{'content': 'The best indicator of acute malnutrition is \nSelect and explain. \nA. Weight for height, B. Weight for age, C. Height for age, D. BMI <2SD', 'role': 'user'}, {'content': "Answer: A \nExplanation: Severe acute malnutrition is defined by a very low weight for height (below-3z scores of the median WHO growth standards), by visible severe wasting, or by the presence of nutritional edema.(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 301)", 'role': 'assistant'}]