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
All of the following are ketone bodies EXCEPT 
Select and explain. 
A. Alpha ketoglutarate, B. Acetone, C. Acetoacetate, D. Beta-hydroxy butyrate
A: Alpha ketoglutarate
Answer: A: Alpha ketoglutarate 
Explanation: Primary ketone body-Acetoacetate.
Secondary ketone bodies- Acetone, Beta-hydroxybutyrate.
Neutral Ketone body-Acetone.
Ketone body excreted through lungs-Acetone.
Site of synthesis of ketone bodies-Liver mitochondria.
Organs which do not utilize ketone bodies-Liver, RBCs.
Rate limiting step of ketone body synthesis-HMG CoA Synthase.
Ketone bodies that do not answer Gerhardt's test- Betahydroxybutyrate and Acetone.
Ketone body that does not answer neither Rothera test nor Gerhardt's test-Betahydroxybutyrate.