This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biological Function of Proteins, Subject name: Biochemistry
[{'content': 'Taurine is biosynthesized from- \nSelect and explain. \nA. Arginine, B. Leucine, C. Valine, D. Cysteine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. Cysteine', 'role': 'assistant'}]