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
[{'content': 'Nicolsky’s sign is seen in \nSelect and explain. \nA. Pemphigus, B. Chronic desquamative gingivitis, C. Haily Haily disease, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Nicolsky's sign\nIf non ulcerated gingiva are massaged, epithelium readily strips from connective tissue to tive surface, which bleeds readily. Seen in\n\nPemphigus\nChronic desquamative gingivitis\nHaily-Haily disease\nEpidermolysis bullosa", 'role': 'assistant'}]