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
Sever&;s disease involves which of the following bone ? 
Select and explain. 
A. lunate, B. Tibial tubercle, C. calcaneum, D. Navicular
C: calcaneum
Answer: C: calcaneum 
Explanation: type of osteochondritis bone affected Kienbock Lunate osgood shalter tibial tuberosity Sever&;s Calcaneum Kohler Navicular ref : maheswari 9th ed