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': 'Lacy white lesion in mouth with pterygium is seen in – \nSelect and explain. \nA. Psoriasis, B. Ptirysis alba, C. Lichen planus, D. Leprosy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mucosal lesions that present as a white net like eruption, i.e. lacy pattern and pterygium of nails is suggestive of Lichen planus.', 'role': 'assistant'}]