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 are involved in \nSelect and explain. \nA. Pemphigus, B. Pemphgoid, C. Psoriasis, D. Dermatitis Herpetiformis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Psoriasis', 'role': 'assistant'}]