This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal Infections, Subject name: Orthopaedics
[{'content': 'True about bony ankylosis: \nSelect and explain. \nA. Painful condition, B. Tubercular arthritis is most common cause, C. Septic arthritis leads to bony ankylosis, D. Spine tuberculosis is the leading cause', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Septic arthritis leads to bony ankylosisRef: Maheshwari 5th ed./182Bony Ankylosis Vs Fibrous AnkylosisBONYFIBROUS* Painless* MCC: Septic arthritis > TB spine* Painful* MCC: Tubercular arthritis of hip and knee', 'role': 'assistant'}]