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 cause of cold abscess of chest wall is? 
Select and explain. 
A. Pott's spine, B. TB abscesses of chest wall, C. TB of ribs, D. Intercostal lymphadenitis
A: Pott's spine
Answer: A: Pott's spine 
Explanation: Ans. is 'a' i.e., Pott's spine