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': "Nail's involvement is NOT a feature of: March 2003 \nSelect and explain. \nA. Psoriasis, B. DLE, C. Dermatomyositis, D. Lichen planus", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. DLE Discoid lupus is a benign variant of SLE in which only the skin is involved.', 'role': 'assistant'}]