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
Rx of choice for Lichen planus? 
Select and explain. 
A. Topical salicylic acid, B. UV rays, C. Systemic steroids, D. Erythromycin
C: Systemic steroids
Answer: C: Systemic steroids 
Explanation: 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.