This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infections, Subject name: Dental
[{'content': 'Which of the following is not a tuberculid? \nSelect and explain. \nA. Lichen scrofuloderma, B. Lichen nitidus, C. Papulonecrotic tuberculide, D. Erythema nodosum', 'role': 'user'}, {'content': "Answer: B \nExplanation: Lichen nitidus is a rare variant of lichen planus Characterized by the presence of pinpoint to pinhead sized papules which are symptomatic and flesh-colored with a flat shiny surface Tuberculids is a cutaneous hypersensitivity reaction to hematogenous dissemination of Mycobacterium tuberculosis or its antigen in a person with strong anti-tuberculous cell-mediated immunity Tuberculids are grouped as Micropapular -lichen scrofulosorum Papular- papulonecrotic tuberculid Nodular-erythema induratum Ref Harrison 20th edition pg 1211 (Ref: Page 1198 Rook's chapter 37.10) (Ref: Rook's page 779 chapter 27.24 )", 'role': 'assistant'}]