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: Dental
[{'content': 'Skin TB which involves skin after involving lymph nodes – \nSelect and explain. \nA. Scrofuloderma, B. Lupus vulgaris, C. Lupus erythematous, D. Lupus pernio', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Scrofulodenna is cutaneous tuberculosis due to direct extension of infection from an underlying tuberculosis present either in a lymphnode, bone or a joint.', 'role': 'assistant'}]