This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Anatomy
An 8-yr old boy presents witha gadually progessing swelling and pain since 6 months over the upper tibia. On X-ray there is alytic lesion with scleotic margins in the upper tibial metaphysis. The diagnosis is 
Select and explain. 
A. Osteogenic carcinoma, B. Osteoclastoma, C. Brodie's abscess, D. Ewing's sarcoma
C: Brodie's abscess
Answer: C: Brodie's abscess 
Explanation: Lytic lesions with sclerotic margins in the upper end of tibia in an 8 yr old boy suggests the diagnosis of Brodie&;s abscess. lytic lesions with sclerotic margins are seen in: simple bone cyst brodie&;s abscess osteoblastoma chondroblastoma. ref : maheswari 9th ed