This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine System, Subject name: Physiology
[{'content': 'Adrenal medulla secretes: \nSelect and explain. \nA. Sex hormones, B. Thyroid stimulating hormones, C. Epinephrine, D. Glucocoicoid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tyrosine - L-dopa - Dopamine - Noradrenaline - Adrenaline Coversion of Noradrenaline to Adrenaline requires the following enzyme - PNMT: Phenylethanolamine N- methyltransferase PNMT: Not present in sympathetic post ganglionic nerve fibers Therefore, sympathetic post-ganglionic nerve fibers release norepinephrine', 'role': 'assistant'}]