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': 'Which of the following chemical reaction is involved in the conversion of noradrenaline to adrenaline? \nSelect and explain. \nA. Hydroxylation, B. Carboxylation, C. Methylation, D. Dehydrogenation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Catecholamines are derivatives of phenylalanine/tyrosine. "Nor" in noradrenaline (norepinephrine) indicates the absence of methyl group. The methyl group of adrenaline (epinephrine) is derived from S-Adenosyl methionine (AdoMet)', 'role': 'assistant'}]