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
Chronic desquamative gingivitis is seen in which type of lichen planus: 
Select and explain. 
A. Atrophic lichen planus., B. Hypertrophic lichen planus., C. Ulcerative lichen planus., D. Hyperplastic lichen planus.
A: Atrophic lichen planus.
Answer: A: Atrophic lichen planus. 
Explanation: None