This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blistering disorders, Subject name: Dental
Nikolsky's sign is positive in following conditions except: 
Select and explain. 
A. Pemphigus vulgaris, B. Toxic epidermal necrolysis, C. Epidermolysis bullosa, D. Pemphigoid
D: Pemphigoid
Answer: D: Pemphigoid 
Explanation: Nikolsky's Sign is seen in: Pemphigus (vulgaris and foliaceous). Porphyria Sjogren's syndrome SSSS TEN (Lyell's disease) Epidermolysis bullosa congenita It occurs due to separation of epidermis from underlying dermis due to intraepidermal cleaving