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: Unknown
Bullous pemphigoidis characterized by 
Select and explain. 
A. Blisters coming on urticarial skin, B. A positive Nikolsky sign, C. Easily rupturing blisters, D. Acantholysis
A: Blisters coming on urticarial skin
Answer: A: Blisters coming on urticarial skin 
Explanation: Bullous pemphigoid ischaracterized by non acantholytic blisters on trunk and limbs. .
It is characterized by a negative Nikolsky’s sign, so B is incorrect.
Blisters of bullous pemphigoid are tense and not at all easily ruptured, so C is incorrect.
Typical tense blisters of BP come on red/ urticarial base in elderly population