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: Biochemistry
Fatty acids are the main source of energy for : 
Select and explain. 
A. Muscles, B. Heart, C. Liver, D. RBC
B: Heart
Answer: B: Heart 
Explanation: Fed State Preferred fuel
Starvation preferred fuel






RBC
Heart
Brain
Liver
Muscle
Adipose tissue


Glucose
			Fatty acids
			Glucose
			Glucose
			Glucose
			Glucose
Glucose 
			Ketone bodies
			Ketone bodies
			Fatty acids / proteins
			Fatty acids
			Fatty acids