This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acid Metabolism, Subject name: Biochemistry
Succinyl CoA is formed by? 
Select and explain. 
A. Valine, B. Isoleucine, C. Methionine, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. (d) All of the aboveRef Lippincott 4/e, / 261