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
PAN-SH site of fatty acid synthase complex accepts 
Select and explain. 
A. Acetyl CoA, B. Malonyl CoA, C. Propionyl CoA, D. All
B: Malonyl CoA
Answer: B: Malonyl CoA 
Explanation: Malonyl - CoA 

Central thiol or Pan -SH or 4-phosphopantetheine of ACP →  Accepts malonyl group
Peripheral thiol or cysteine -SH group of 3-ketoacyl synthase  → Accepts acetyl group