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': 'Auspitz sign is related to – \nSelect and explain. \nA. Pemphigus, B. Psoriasis, C. Lupus vulgaris, D. Lichen planus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]