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
Mucosa is involved in – 
Select and explain. 
A. Psoriasis, B. Lichen planus, C. Alopecia, D. Scabies
B: Lichen planus
Answer: B: Lichen planus 
Explanation: Diseases involving oral mucosa :- Lichen plaints, Pemphigus, Infections (Candida, Secondary syphilis, HSV), Leucoplakia, Erythema multiforme, Peutz Jegher syndrome, Aphthous ulcers, Bechet's disease, squamous cell carcinoma