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
Succinyl Co-A is formed by: 
Select and explain. 
A. Histidine, B. Leucine, C. Valine, D. Lysine
C: Valine
Answer: C: Valine 
Explanation: Succinyl COA is formed by Valine, Isoleucine, Methionine.