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
[{'content': 'Which of the following enters the TCA cycle at Succinyl CoA step? \nSelect and explain. \nA. Tryptophan, B. Tyrosine, C. Glycine, D. Methionine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Amino acids that enters at succinyl CoA step are :\n\nValine\nIsoleucine\nMethionine\nThreonine.', 'role': 'assistant'}]