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: Pharmacology
[{'content': "Regimen used in non–Hodgkin's Lymphoma is : \nSelect and explain. \nA. CHOP, B. COPP, C. MOPP, D. ABVD", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]