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': 'Ahritis "mutilans" is a feature of \nSelect and explain. \nA. Dermatomyositis, B. Psoriasis, C. SLE, D. Tinea versicolor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Psoriasis', 'role': 'assistant'}]