This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Avascular necrosis and osteochondroses, Subject name: Anatomy
Osteochondritis in Kohler&;s disease affects which bone ? 
Select and explain. 
A. Lunate, B. Patella, C. Navicular, D. Femur head
C: Navicular
Answer: C: Navicular 
Explanation: types of osteochondritis Bones affected Kohler Navicular Keinbock Lunate Pehes Femur head Johanson- Larsens lower pole of patella REF : MAHESWARI 9TH ED