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
Tom-smith arthritis results from 
Select and explain. 
A. Rheumatoid arthritis, B. Osteo arthritis, C. Septic arthritis, D. Garre's osteomyelitis
C: Septic arthritis
Answer: C: Septic arthritis 
Explanation: (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