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': 'Most characteristic feature of lichen planus is – \nSelect and explain. \nA. Thinning of nail plate is most common, B. Non scarring alopecia, C. Violaceous lesions on skin and mucous membrane, D. Wickham striae', 'role': 'user'}, {'content': "Answer: D \nExplanation: Wickham's stria is characteristic for Lichen planus.\nViolaceous lesions are seen on skin (not on mucosa).", 'role': 'assistant'}]