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: Pathology
[{'content': 'Chronic desquamative gingivitis is seen in which type of lichen planus: \nSelect and explain. \nA. Atrophic lichen planus., B. Hypertrophic lichen planus., C. Ulcerative lichen planus., D. Hyperplastic lichen planus.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]