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': 'Which is not a primary cutaneous disorder \nSelect and explain. \nA. Lichen planus, B. Psoriasis, C. Reiters disease, D. Bowen Disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Reiters disease', 'role': 'assistant'}]