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: Surgery
Most common site of TB ? 
Select and explain. 
A. Spine, B. Knee, C. Hip, D. Shoulder
A: Spine
Answer: A: Spine 
Explanation: Ans. is 'a' i.e., Spine Skeletal tuberculosis Tuberculous infection of bone (osteomyelitis) is a form of secondary osteomyelitis caused by hematogenous dissemination from a primary infected visceral focus. The primary focus may be active or quiescent, apparent or latent, either in the lungs, lymph glands or other viscera.