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
What is the percent of total energy ratio supplied by fish protein (PE % Kcal) - 
Select and explain. 
A. 20, B. 40, C. 60, D. 80
D: 80
Answer: D: 80 
Explanation: Ref: Park 25th edition Pgno : 666