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
Ketone bodies are not used by ? 
Select and explain. 
A. Muscle, B. Brain, C. RBC, D. Renal coex
C: RBC
Answer: C: RBC 
Explanation: Ans. is 'c' i.e., RBC Only glucose is the sole fuel for RBCs. As RBCs have no mitochondria, they oxidize glucose anaerobically to lactate. Liver also cannot use ketone bodies because of lack of succinyl-CoA-acetoacetate-CoA transferase, which is required for activation of ketone bodies.