This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune skin disorders, Subject name: Dental
[{'content': 'Sexually active male comes with complaints of recurrent ulcers over the glans which heals with hyperpigmentation, probable diagnosis is - \nSelect and explain. \nA. Aphathous ulcer, B. Fixed drug eruption, C. Herpes genitalis, D. Chlamydial infection', 'role': 'user'}, {'content': "Answer: B \nExplanation: Fixed drug eruption manifests as skin lesions at fixed sites following drug intake. The lesions progressively fade over several days often leaving a residual post inflammatory brown pigmentation. Page no.294. Reference IADVL's concise textbook of dermatology", 'role': 'assistant'}]