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: Skin
[{'content': 'In psoritic ahropathy TOC is \nSelect and explain. \nA. Mtx, B. 5FU, C. PUVA, D. Steroid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Mtx', 'role': 'assistant'}]