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
Severe acute malnutrition (SAM) according to the WHO criteria is: 
Select and explain. 
A. 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
D: Weight for height less than median minus -3SD
Answer: D: Weight for height less than median minus -3SD 
Explanation: 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