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
In a well fed state, acetyl CoA obtained from diet is least used in the synthesis of 
Select and explain. 
A. Palmity CoA, B. Citrate, C. Acetoacetate, D. Oxalosuccinate
C: Acetoacetate
Answer: C: Acetoacetate 
Explanation: Ketone bodies (acetoacetate) synthesis is decreased in fed state, so acetyl-CoA is not used for synthesis of ketone bodies in fed state.

About other options

Fatty acid (palimitoyl CoA) synthesis is increased in fed state. Fatty acids are synthesized from acetyl-CoA.
In fed state acetyl-CoA is oxidized via TCA cycle. Acetyl-CoA condenses with oxaloacetate to form citrate.
Oxalosuccinate is an intermediate of TCA cycle.