This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Kanawati index is used for ? 
Select and explain. 
A. Air population, B. PEM, C. Obesity definition, D. Infectivity
B: PEM
Answer: B: PEM 
Explanation: Ans. is 'b' i.e., PEM Kanawati index is used to classify protein energy malnutrition (PEM).