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': 'Best marker for chronic PEM is - \nSelect and explain. \nA. Weight for age, B. Height for age, C. Weight for Height, D. Head circumference', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Height for age Assessment of PEM* Weight for age = Acute* Height for age = Chronic* Weight for Height = Acute on chronicAge dependent factors* Weight# Height* Head circumference# Chest circumferenceAge independent factor* Mid arm circumference# Kanawati index* Me Laren's index# Quae stick* Shakir tape# Skin fold thickness* Rao & Singh# Dugdale* Jelleff's ration", 'role': 'assistant'}]