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
Enzyme in fatty acid synthase complex that has pantothenic acid as coenzyme: 
Select and explain. 
A. Acetyl transacylase., B. Thioesterase., C. Enoyl reductase., D. Acyl carrier protein.
D: Acyl carrier protein.
Answer: D: Acyl carrier protein. 
Explanation: In eukaryotic cells, including man, the fatty acid synthase exists as a dimmer with two identical units. Each monomer possesses the activities of seven different enzymes and an acyl carrier protein (ACP) bound to 4’ phosphopentethiene.