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
Nail are involved in 
Select and explain. 
A. Pemphigus, B. Pemphgoid, C. Psoriasis, D. Dermatitis Herpetiformis
C: Psoriasis
Answer: C: Psoriasis 
Explanation: C i.e. Psoriasis