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
Which is not a primary cutaneous disorder 
Select and explain. 
A. Lichen planus, B. Psoriasis, C. Reiters disease, D. Bowen Disease
C: Reiters disease
Answer: C: Reiters disease 
Explanation: Reiters disease