This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
Ponderal index for a malnourished child is ____________ 
Select and explain. 
A. < 1, B. < 2, C. < 4, D. < 6
B: < 2
Answer: B: < 2 
Explanation: PI is calculated from measurements of body mass (M) and height (H). PI = the cube root of body weight divided by height, where body mass is in kilograms and height in meters. Be aware that there are variations of this formula which are also sometimes called the Ponderal Index. Ref.nelson 20th edition page 339 nutrition chapter