This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Conversion of norepinephrine to epinephrine occur by \nSelect and explain. \nA. Methylation, B. Decarboxylation, C. Oxidation, D. Sulphation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Synthesis of NA occurs in all adrenergic neurons while that of adrenaline occurs only in the adrenal medullary cells. It requires a high concentration of glucocoicoids reaching through the intra- adrenal poal circulation for induction of the methylating enzyme - N methyltransferase. From essential of medical pharmacology K D Tripati 7th edition Page no 124', 'role': 'assistant'}]