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
Definition of severe acute malnutrition includes which of the following? 
Select and explain. 
A. Wt for Ht <- 2 SD, B. Wt for Ht <- 3 SD, C. Wt for age <-2 SD, D. Wt for age <-3 SD
B: Wt for Ht <- 3 SD
Answer: B: Wt for Ht <- 3 SD 
Explanation: 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.