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 groups of amino acids produce a common component of the TCA cycle? \nSelect and explain. \nA. Alanine, isoleucine, leucine, lysine, B. Serine, asparagine, glycine, glutamate, C. Isoleucine, valine, methionine, D. Proline, leucine, tryptophan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]