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: Skin
[{'content': 'Mouth Lesion are seen in: \nSelect and explain. \nA. Psoriasis, B. Lichen Planus, C. Basal Cell CA, D. Icthyosis Vulgaris', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Lichen planus', 'role': 'assistant'}]