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: Orthopaedics
Most common cause of Bony ankylosis 
Select and explain. 
A. TB Hip, B. TB Knee, C. Septic arthritis, D. Pott's spine
C: Septic arthritis
Answer: C: Septic arthritis 
Explanation: None