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': "Which of the following causes bony ankylosis \nSelect and explain. \nA. TB, B. Septic ahritis, C. Gouty ahritis, D. Behcet's disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: CAUSES OF BONY ANKYLOSIS : TRAUMA HEMAHROSIS SUPPURATIVE AHRITIS RHEUMATOID AHRITIS OSTEOMYLITIS FRACTURE OF CONDYLE REF : MAHESWARI 9TH ED', 'role': 'assistant'}]