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
[{'content': 'The reference protein is ? \nSelect and explain. \nA. Fish, B. Egg, C. Rice, D. Lemon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]