This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
Commonest bone tumour is 
Select and explain. 
A. Osteoid osteoma, B. Compact osteoma, C. Osteoblastoma, D. Solitary bone cyst
A: Osteoid osteoma
Answer: A: Osteoid osteoma 
Explanation: A. i.e. (Osteoid ostoma) (312 - Current diagnosis and Treatment 4th)OSTEOID OSTEOMA* Most common benign osteoid- forming tumor is the osteoid osteoma* More common in male (second decade)* Proximal femur is the most common site*** Dull aching pain is the most frequent symptom* Characteristic x-ray finding - central lytic nidus* The non ossifying fibroma of bone is the most commn benign tumor of bone and the solitary osteochondroma is the second most common (315- Current diagnosis & Treatment - orthopedics)* Simple bone cysts are a common pseudotumor of bone and the most frequent cause ofpathologic fractures in children (320 CDT - orthopaedics 4th)