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: Pathology
[{'content': 'A twenty-one-year-old woman complains that regular,\ngentle brushing of her teeth is painful besides causing profuse bleeding. Oral examination reveals the loss of epithelium from the attached gingival of both arches. Which of the following dermatological problems is this patient most likely to have? \nSelect and explain. \nA. Benign mucous membrane pemphigiod, B. Chronic discoid lupus erythematosus, C. Pemphigus, D. Psoriasis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]