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 positive in all of the following except: 
Select and explain. 
A. Staphylococcal scalded skin syndrome, B. Toxic epidermonecrolysis, C. Bullous pemphigoid, D. Pemphigus
C: Bullous pemphigoid
Answer: C: Bullous pemphigoid 
Explanation: C. i.e. Bullous pemphigoid