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
The reference protein is - 
Select and explain. 
A. Fish, B. Egg, C. Rice, D. Lemon
B: Egg
Answer: B: Egg 
Explanation: Ans. is 'b' i.e., Egg * Eggs are used in nutrition studies as a "reference protein" as eggs proteins are considered to be the best among food proteins because of their high biological value and digestibility.* So NPU is also high because it is the product of biological value and digestibility cofficient divided by 100.