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: Unknown
BMI level for men which is considered as lethal is: 
Select and explain. 
A. 11, B. 13, C. 12, D. 15
B: 13
Answer: B: 13 
Explanation: Ref. Foundations of Community medicine. Page. 293
 
Body mass index (BMI) is an estimate of total body fat mass

Simply an index of weight for height.

● Formula: Weight in kilograms divided by the square of height in meters.
● Uses:

Body mass index = Weight (kg)/(Height)2 (m)
Used to classify and define underweight, overweight & obesity in adults.
BMI value considered lethal for Men is 13 and for female is 11