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
[{'content': 'Protein is assessed by - \nSelect and explain. \nA. Protein energy ratio, B. BUN, C. Per gm calories given, D. Amino acid score', 'role': 'user'}, {'content': "Answer: A \nExplanation: - one way of evaluating food as the source of protein is to determine what percent of their energy value is supplied by their protein content. This is known as protein energy ratio. - PE percent= energy from protein*100/ total energy in diet. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:634 <\\p>", 'role': 'assistant'}]