This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fungal infections, Scabies, Pediculosis, Subject name: Dental
[{'content': 'Mucosa is involved in \nSelect and explain. \nA. Psoriasis, B. Lichen planus, C. Alopecia, D. Porphyria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In lichen planus there are oral and genital lesions. There is nail and scalp involvement also. All the other given conditions do not produce mucosal involvement. Iadvl textbook of dermatology', 'role': 'assistant'}]