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
Rank the food items in descending order of their energy yield per 100 grams Carbohydrate – A, Fats – B, Alcohol – C 
Select and explain. 
A. B C A, B. A B C, C. C A B, D. C B A
A: B C A
Answer: A: B C A 
Explanation: None