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
Each gram of fat supplies how many kcal of energy: 
Select and explain. 
A. 5, B. 9, C. 12, D. 13
B: 9
Answer: B: 9 
Explanation: The various nutrients provide energy as follows: Nutrient Energy in kcal/ gram Protein 4 Carbohydrate 4 Fat 9 Dietary Fibres 2 Ref: Park 21st Edition, Page 585.