This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acid Metabolism, Subject name: Biochemistry
[{'content': 'Tyrosine is synthesized from- \nSelect and explain. \nA. Tryptophan, B. Phenylalanine, C. Histidine, D. Methionine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Phenylalanine o Phenylalanine metabolism is initiated by its oxidation to tyrosine which then undergoes oxidative degradation.", 'role': 'assistant'}]