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? 
Select and explain. 
A. Tibial tuberosity, B. Femur head, C. Navicular, D. Calcaneum
A: Tibial tuberosity
Answer: A: Tibial tuberosity 
Explanation: Ans. is 'a' i.e., Tibial tuberosity