This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
Which of the following enzyme uses citrate in fatty acid synthesis? 
Select and explain. 
A. Aconitase, B. Citrate synthase, C. Malic enzyme, D. ATP citrate lyase
B: Citrate synthase
Answer: B: Citrate synthase 
Explanation: Reference: Harpers illustrated biochemistry 30th edition