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': 'A young female presented with lucy linear lesions on tongue since a month with elongation of nail fold beyond the nail bed. What is the diagnosis – \nSelect and explain. \nA. Psoriasis, B. Geographic tongue, C. Lichen planus, D. Candidiasis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: This young female has\n\n\nLacy linear lesions on tongue\nElongation of nail fold beyond nail bed →\xa0pterygium\n\n\nDiagnosis is Lichen planus.', 'role': 'assistant'}]