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
Bullae formation after striking an intact skin/mucosal surface is known as: 
Select and explain. 
A. Tine's sign, B. Bablnski's sign, C. Nikolsky's sign, D. Chovstek's sign
C: Nikolsky's sign
Answer: C: Nikolsky's sign 
Explanation: None