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': 'Rx of choice for Lichen planus? \nSelect and explain. \nA. Topical salicylic acid, B. UV rays, C. Systemic steroids, D. Erythromycin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: LP is essentially benign and self-limiting disease. Steroids- Mainstay of Rx. Oral steroids: Extensive LP Bullous LP Follicular LP of scalp Extensive ulcerative lesions on the oral or vaginal mucosa. Nail atrophy and pterygium Other Rx: Azathioprine Dapsone In generalised cases phototherapy is given.', 'role': 'assistant'}]