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
All are true about Net protein utilization (NPU) except 
Select and explain. 
A. Defined as Nitrogen retained by Nitrogen consumed X 100, B. 1 gram protein is equivalent to 1 gram Nitrogen, C. Good for estimating protein quality, D. Egg has the highest NPU value
B: 1 gram protein is equivalent to 1 gram Nitrogen
Answer: B: 1 gram protein is equivalent to 1 gram Nitrogen 
Explanation: • 1 gram of proteins is equivalent to: 6.25 grams Nitrogen
• NPU of India diets: 50-80