This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lichen planus and Other papulosquamous disorders, Subject name: Dental
[{'content': 'Lacy White lesions in the mouth with pterygium is seen in: \nSelect and explain. \nA. Psoriasis, B. P. Alba, C. Lichen planus, D. Leprosy', 'role': 'user'}, {'content': "Answer: C \nExplanation: Purple polygonal papules marked by severe pruritus; lacy white markings called as Wickam's Striae, especially associated with mucous membrane lesions & pterygium are diagnostic of Lichen planus.", 'role': 'assistant'}]