This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Papulosquamous disorders, Subject name: Dental
[{'content': 'This is seen commonly in \nSelect and explain. \nA. SLE, B. Lichen planus, C. Psoriasis, D. Leprosy', 'role': 'user'}, {'content': "Answer: B \nExplanation: Surface of the papules in lichen planus often reveals a network of grey lines (Wickham's striae). Typically seen in oral mucosa Oral lichen planus (LIE-kun PLAY-nus) is an ongoing (chronic) inflammatory condition that affects mucous membranes inside your mouth. Oral lichen planus may appear as white, lacy patches; red, swollen tissues; or open sores. These lesions may cause burning, pain or other discomfo. Ref: Harrison 19e pg: 349", 'role': 'assistant'}]