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 (SAM) according to the WHO criteria is: \nSelect and explain. \nA. Weight for age less than median plus -2SD, B. Weight for height less than median plus 2SD, C. Weight for age less than median plus 3SD, D. Weight for height less than median minus -3SD', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Severe acute malnutrition (SAM) according to the WHO criteria is Weight for height less than median minus -3SD. Severe acute malnutrition (SAM) in children of ages 6 to 59 months is defined by the WHO as any of the following: Weight-for-length (or height) below -3SD of the WHO child growth standards. Presence of bipedal edema Mid-Upper arm circumference <11.5cm Ref: Ghai Essential Pediatrics 9th edition PGno: 97', 'role': 'assistant'}]