This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection of Bones & Joints, Subject name: Orthopaedics
[{'content': 'Tom Smith arthritis involves \nSelect and explain. \nA. Knee, B. Hip, C. Ankle, D. Wrist', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b (Hip) (Ref Maheshwari orthopedics 4th/165)TOM SMITH ARTHRITIS# Septic arthritis of hip joint in infant# Acute onset with rapid abscess formation# Head of femur is cartilaginous at this age and hence rapidly and completely destroyed by the pyogenic process.# Affected limb shorter and hip movements are increasd in all directions# Telescopy test +.# Complete absence of the head and neck of femur and normally developed round acetabulum on X-ray differentiates it from CDH.# Rx:- Arthroscopic wound lavage (minimally invasive Rx).', 'role': 'assistant'}]