This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Phenylalanine and Tyrosine metabolism Detail, Subject name: Biochemistry
[{'content': 'Rate limiting step in catecholamine synthesis:- \nSelect and explain. \nA. Phenylethanolamine N-methyltransferase, B. Dopadecarboxylase, C. Tyrosine hydroxylase, D. Tryptophan decarboxylase A', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Catecholamines are epinephrine, norepinephrine and dopamine. L-DOPA is the precursor of all catecholamines The diagram given below shows the synthesis of L-DOPA and the rate limiting enzyme in the synthesis is tyrosine hydroxylase.', 'role': 'assistant'}]