This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteochondritis and Avascular Necrosis, Subject name: Orthopaedics
A body builder taking steroids and creatinine presented with hip pain and unable to squat. On MRI, femoral aicular surface is disrupted and there is cresent sign seen on radiograph. What is the diagnosis? 
Select and explain. 
A. AVN, B. Osteochondroma, C. TB hip, D. Fracture neck of femur
A: AVN
Answer: A: AVN 
Explanation: History of intake of steroids usually results in avascular necrosis. The classic appearance of a thin subchondral fracture line known as "Crescent sign". It is seen on X -ray signifies Avascular necrosis. Most common location of AVN is Head of Femur which is called Chandelier's sign.