This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Papulosquamous Disorders, Subject name: Skin
[{'content': 'Which of the following is/are not a subtype of lichen planus: \nSelect and explain. \nA. Ulcerative lichen planus, B. Lichen nitidus, C. Hypertrophic lichen planus, D. Lichen scrofulosorum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Ulcerative lichen planus, d. Lichen scrofulosorumThe clinical presentation of lichen planus has several forms: actinic (in sun-exposed areas), annular, atrophic, erosive/ulcerative, follicular, hypertrophic, linear, pigmented, and vesicular/bullous.Lichen scrofulosorum is a type of tuberculid which occurs due to mycobacterial hypersensitivity.Lichen nitidus is a rare skin condition that usually appears as tiny, skin-colored, glistening bumps on the surface of your skin. Lichen nitidus results from abnormal inflammatory activity in skin cells, but the cause of inflammation is unknown.', 'role': 'assistant'}]