This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Subject name: Pediatrics
Rao and Singh's index is? 
Select and explain. 
A. Age-dependent index, B. Age-independent index, C. Age and sex-dependent index, D. Independent of wt and ht
B: Age-independent index
Answer: B: Age-independent index 
Explanation: RAO & SINGH'S INDEX: - It is calculated as Weight (in kg) x 100/height2 (in cm) - Normal value: 0.14 - In children with malnutrition: 0.12 - 0.14