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
Citrate to cis-aconitate conversion is inhibited by? 
Select and explain. 
A. Malonate, B. Fluoride, C. Arsenite, D. Fluoroacetate
D: Fluoroacetate
Answer: D: Fluoroacetate 
Explanation: Ans. is 'd' i.e., FluoroacetateConversion of citrate to cis-aconitate is a step of Kreb's cycle, catalyzed by Aconitase. Aconitase is inhibited by fluoroacetate.