This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Vasodilator Nitric oxide is derived from which of the following: \nSelect and explain. \nA. Proline, B. Histidine, C. Arginine, D. Lysine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Derivatives of amino acids Proline is conveed to glutamate (by a series of steps) and then transaminated to alpha-ketoglutarate Histidine on decarboxylation, gives the corresponding amine i.e. histamine Arginine is the substrate for the production of nitric oxide (NO)', 'role': 'assistant'}]