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
[{'content': "Fibrous ankylosis is caused by which of the following: March 2005 \nSelect and explain. \nA. Septic ahritis, B. TB ahritis, C. Bechet's disease, D. Psoriatic ahritis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: TB Ahritis', 'role': 'assistant'}]