This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
All are TRUE regarding Net Protein Utilisation, except - 
Select and explain. 
A. It is the increase in weight per unit weight of consumed, B. NPU of cow - milk is 81%, C. NPU of average Indian food is 50-80%, D. If NPU is low, more protein is required
A: It is the increase in weight per unit weight of consumed
Answer: A: It is the increase in weight per unit weight of consumed 
Explanation: Increase in weight per unit weight of consumed is called protein efficiency. NPU is the nitrogen retained by the body per nitrogen intake. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 586)