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
Triple deformity of the knee is a complication of: September 2012 
Select and explain. 
A. Tuberculosis, B. Osteoahritis, C. Septic ahritis, D. All of the above
A: Tuberculosis
Answer: A: Tuberculosis 
Explanation: Ans. A i.e. Tuberculosis Skeletal TB MC site of skeletal TB: Veebrae In Spine, TB stas in: Veebral body MC region involved in spinal TB: T9-L1 Earliest symptom of spinal TB: Pain Earliest X-ray sign in Pott's disease: Narrowing of disc space