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': 'Button hole sign is seen in: \nSelect and explain. \nA. Lupus vulgaris, B. Intertigo, C. Neuro fibromatosis, D. Psoriasis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Due to defect in dermis, pressure on a neurofibroma gives a feeling of hole in dermis, which is called as Button hole sign.', 'role': 'assistant'}]