This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Food Security, and Health, Subject name: Pediatrics
[{'content': 'How is under-nutrition defined? \nSelect and explain. \nA. Weight for age < -2 SD, B. Weight for height < -2 SD, C. Weight for age < -3 SD, D. Weight for height < - 3 SD', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Weight for height < -2 SD (Ref: Ghai 8/e p96)Under nutrition is defined in terms of Height for Height, i. e. < -2 SD. Height for Height < -3 SD is severe under nutrition.Indicators of MalnutritionIndicatorParameterInterpretationStuntingLow height for ageChronic malnutritionQWastingLow weight for heightAcute malnutritionQUnder weightLow weight for ageBoth acute & chrome malnutritionQ WHO Classification of Malnutrition Moderate malnutritionSevere malnutrition (type)Symmetrical edemaNoYes (edematous malnutrition)Weight-for-heightSD score from -2 to -3SD score < -3 (severe wasting)Height-for-ageSD score from -2 to -3SD score < -3 (severe stunting)', 'role': 'assistant'}]