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': 'What is the percent of total energy ratio supplied by fish protein (PE % Kcal) - \nSelect and explain. \nA. 20, B. 40, C. 60, D. 80', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref: Park 25th edition Pgno : 666', 'role': 'assistant'}]