This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Pediatrics
[{'content': 'Definition of severe acute malnutrition includes which of the following? \nSelect and explain. \nA. Wt for Ht <- 2 SD, B. Wt for Ht <- 3 SD, C. Wt for age <-2 SD, D. Wt for age <-3 SD', 'role': 'user'}, {'content': 'Answer: B \nExplanation: b. Wt for Ht <-3SD(Ref: Ghai 9/e p 97)Wt for Ht <-3SD on WHO growth standard is one of the diagnostic criteria for severe acute malnutrition.', 'role': 'assistant'}]