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': 'Mucosa is involved in – \nSelect and explain. \nA. Psoriasis, B. Lichen planus, C. Alopecia, D. Scabies', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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", 'role': 'assistant'}]