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 is involved in: \nSelect and explain. \nA. Psoriasis, B. Lichen planus, C. Fungal infection, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e., Psoriasis B Lichen planus C i.e., Fungal infection', 'role': 'assistant'}]