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': 'Regarding Lichen planus all are true except – \nSelect and explain. \nA. Hypopigmentation in residual disease, B. Lymphatic infiltration in supradermal layer, C. Itchy, polygonal, purple, papule, D. Skin, Hair & oral mucosa commonly involved', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lesions of Lichen planus heal by leaving behind hyperpigmentation (not hypopigmentation).', 'role': 'assistant'}]