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
Skin TB which involves skin after involving lymph nodes – 
Select and explain. 
A. Scrofuloderma, B. Lupus vulgaris, C. Lupus erythematous, D. Lupus pernio
A: Scrofuloderma
Answer: A: Scrofuloderma 
Explanation: Scrofulodenna is cutaneous tuberculosis due to direct extension of infection from an underlying tuberculosis present either in a lymphnode, bone or a joint.