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: Orthopaedics
An 8-year-old boy presents with a gradually progressing swelling and pain since 6 months over the upper tibia. On x-ray, there is a lytic lesion with sclerotic margins in the upper tibial metaphysis. The diagnosis is - 
Select and explain. 
A. Osteogenic sarcoma, B. Osteoclastoma, C. Brodie's abscess, D. Ewing's sarcoma
C: Brodie's abscess
Answer: C: Brodie's abscess 
Explanation: Lytic lesion with sclerotic margin in upper end of tibia in an 8-year-old by suggests the diagnosis of Brodie's abscess (among the given options).
Lytic lesions with sclerotic margins is seen in : -

i) Simple bone cyst                        
ii) Brodie's abscess  
iii) Osteoblastoma         
iv) Chondroblastoma