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': 'Decarboxylation of which of the following amino acids results in formation of a vasodilator: \nSelect and explain. \nA. Valine, B. Arginine, C. Histidine, D. Glutamic acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]