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
Nikolsky sign is seen in - 
Select and explain. 
A. Pemphigus vulgaris, B. Herpes zoster, C. Herpes simlex, D. All
D: All
Answer: D: All 
Explanation: D. i.e. All