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
[{'content': "Nikolsky's sign is positive in following conditions except: \nSelect and explain. \nA. Pemphigus vulgaris, B. Toxic epidermal necrolysis, C. Epidermolysis bullosa, D. Pemphigoid", 'role': 'user'}, {'content': "Answer: D \nExplanation: 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", 'role': 'assistant'}]