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
A 18 year old male presents with a draining sinus on his left leg with pus discharge and discharge of bony pieces since in 3 months. The diagnosis 
Select and explain. 
A. Chronic osteomyelitis, B. Ewing's Sarcoma, C. Osteoid Osteoma, D. Cellulitis
A: Chronic osteomyelitis
Answer: A: Chronic osteomyelitis 
Explanation: Answer- A. Chronic osteomyelitisA history of bone piece discharge from the chronic sinusis considered diagnostic of chronic osteomyelitis.