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 indicator of acute malnutrition \nSelect and explain. \nA. Weight for height, B. Weight for age, C. Height for age, D. BMI < 2 SD', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Weight for height 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 oedema.", 'role': 'assistant'}]