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: Pathology
[{'content': 'Histamine is formed by of histi dine \nSelect and explain. \nA. Methylatin, B. Reduction, C. Oxidation, D. Carboxylation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Carboxylation', 'role': 'assistant'}]