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: Pathology
Nicolsky’s sign is seen in 
Select and explain. 
A. Pemphigus, B. Chronic desquamative gingivitis, C. Haily Haily disease, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Nicolsky's sign
If non ulcerated gingiva are massaged, epithelium readily strips from connective tissue to tive surface, which bleeds readily. Seen in

Pemphigus
Chronic desquamative gingivitis
Haily-Haily disease
Epidermolysis bullosa