This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Orthopaedics
All of the following are the causes of sudden increase in pain in osteochondroma, except: 
Select and explain. 
A. Sarcomatous change, B. Fracture, C. Bursitis, D. Degenerative changes
D: Degenerative changes
Answer: D: Degenerative changes 
Explanation: Ans. D. Degenerative changesa. Osteochondroma is usually painless. Sudden onset of pain in osteochondroma can be due to:b. Malignant transformationc. Bursitisd. Fracturee. Pressure or traction on neighboring structures (nerve/tendon/muscle)