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: Dental
[{'content': 'Nikolsky sign is positive in all except – \nSelect and explain. \nA. Pemphigus, B. Bullous pemphigoid, C. Toxic epidermal Necrolysis, D. Staphylococcal skin scaled syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]