This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Osgood schlatter disease is osteochondritis of ? 
Select and explain. 
A. Tibial tuberosisty, B. Lunate, C. Calcaneum, D. Navicular
A: Tibial tuberosisty
Answer: A: Tibial tuberosisty 
Explanation: Ans. is 'a' i.e., Tibial tuberosity