This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
The commonest focus of scrofuloderma is 
Select and explain. 
A. Lung, B. Lymph nodes, C. Larynx, D. Skin
D: Skin
Answer: D: Skin 
Explanation: Scrofuloderma is a skin condition caused by tuberculosis involvement of the skin by direct extension, usually from underlying tuberculous lymphadenitis. Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th edition; Pg: 367