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
Lichen planus: 
Select and explain. 
A. Can undergo malignant change, B. Treated only by medication, C. Must be excised, D. Is an idiosyncrasy reaction
A: Can undergo malignant change
Answer: A: Can undergo malignant change 
Explanation: None