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 is involved in: 
Select and explain. 
A. Psoriasis, B. Lichen planus, C. Fungal infection, D. All
D: All
Answer: D: All 
Explanation: A i.e., Psoriasis B Lichen planus C i.e., Fungal infection