This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Pediatrics
Proteins provide _______ Kcal energy per gram 
Select and explain. 
A. 2, B. 4, C. 6, D. 9
B: 4
Answer: B: 4 
Explanation: Carbohydrates provide 4 kcal of energy per gram. Proteins provide 4 kcal energy per gram. Fats provide 9 kcal of energy per gram. Reference: Paediatrics; O.P Ghai; 8th edition; Page no: 88,89