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': 'Severe acute malnutrition as per who criteria is __________ \nSelect and explain. \nA. Weight for height less than median +2 SD, B. Weight for age less than median - 2 SD, C. Weight for age less than median + 3 SD, D. Weight for height less than median - 3 SD', 'role': 'user'}, {'content': 'Answer: D \nExplanation: * Definition of severe acute malnutrition - severe wasting and/or bilateral edema. * Severe wasting is weight for length (or height) that is below -3SD of the WHO Child Growth Standards. * Diagnosis of bilateral edema - by grasping both feet, placing a thumb on top of each, and pressing gently but firmly for 10 seconds. A pit that stays under each thumb denotes bilateral edema. Management of SAM:- Ref:- Nelson 20th edition; pg num:- 301,302', 'role': 'assistant'}]