This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Methionine and Cysteine details, Subject name: Biochemistry
[{'content': 'Taurine is synthesized from which amino acid? \nSelect and explain. \nA. Tryptophan, B. PhenylAlanine, C. Cysteine, D. Alanine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Taurine, a major constituent of bile is synthesized from cysteine', 'role': 'assistant'}]