This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: TCA Cycle, Subject name: Biochemistry
[{'content': 'Which of the following enters the TCA cycle at succinyl-CoA step ? \nSelect and explain. \nA. Histidine, B. Methionine, C. Tryptophan, D. Tyrosine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 4 amino acids enter at Succinyl-CoA step : Valine, Isoleucine, Methionine Threonine.', 'role': 'assistant'}]