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
[{'content': 'Succinyl CoA is formed by? \nSelect and explain. \nA. Valine, B. Isoleucine, C. Methionine, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) All of the aboveRef Lippincott 4/e, / 261', 'role': 'assistant'}]