This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'Succinyl CoA is formed by \nSelect and explain. \nA. Valine, B. Isoleucin, C. Methionine, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Valine,isoleucine and methionine are influx of TCA cycle intermediate propionyl CoA which is conveed to succinyl CoA.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 253, fig 19.9', 'role': 'assistant'}]