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
Other than pemphigus, Nikolsky's sign is positive in: 
Select and explain. 
A. Familial benign chronic pemphigus, B. Hailey- Hailey disease, C. Epidermolysis bullosa, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: “Nikolsky's sign” is positive in:

Pemphigus.
Familial benign chronic pemphigus (hailey-hailey disease).
Recessive dystrophic epidermolysis bullosa .