This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
[{'content': 'Which enzyme is used to convert phenylalanine to tyrosine: \nSelect and explain. \nA. Tyrosine synthase, B. Tyrosine hydroxylase, C. Phenylalanine hydroxylase, D. Phenyl ethanolamine methyltransferase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Phenylalanine hydroxylaseRef: Harpers Biochemistry, 30th ed. pg. 509-510* Phenylalanine hydroxylase: for conversion of Phenylalanine to tyrosine conversion* Tyrosine hydroxylase: for conversion of tyrosine to L-Dopa* Phenyl ethanolamine-N-methyltransferase: for conversion of norepinephrine to epinephrine', 'role': 'assistant'}]