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
Not an indication for surgery in Pott's spine 
Select and explain. 
A. No improvement clinically after 4 weeks of ATT, B. Stage 3 disease, C. Bowel and bladder involvement, D. Stage 4 disease
B: Stage 3 disease
Answer: B: Stage 3 disease 
Explanation: None