This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arthritis, Subject name: Orthopaedics
[{'content': "Tom-smith arthritis results from \nSelect and explain. \nA. Rheumatoid arthritis, B. Osteo arthritis, C. Septic arthritis, D. Garre's osteomyelitis", 'role': 'user'}, {'content': "Answer: C \nExplanation: (Septic arthritis) (39- Apley'8th)* Septic Arthritis in Infancy (TOM-SMITH-ARTHRITS)* The head of the femur is cartilaginous and is rapidly and completely destroyed by pyogenic process* Affected leg is shorter and hip movements are increased in all directions* Telescopy test is positive* X-ray complete absence of the head and neck of the femur", 'role': 'assistant'}]