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
What is cutaneous Tuberculosis secondary to underlying tissue lymph node called 
Select and explain. 
A. Scrofuloderma, B. Lupus vulgaris, C. Spina ventosa, D. None of the above
A: Scrofuloderma
Answer: A: Scrofuloderma 
Explanation: Cutaneous Tuberculosis Scrofuloderma:- It is a result of contiguous spread of infection to skin from underlying disease (usually cervical lymph nodes and bones); fluctuant nodules that develop sinus tracts, draining to skin, with tethered appearance. Ref:- Review of Dermatology by Alikhan; pg num:-302