This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal System, Subject name: Radiology
Expansile lytic lesion with fluid-fluid levels within the metaphysis of fibula seen in CT/MRI in an early adolescent female is typical of: 
Select and explain. 
A. Giant cell tumor, B. Aneurysmal bone cyst, C. Hemangioma, D. Fibrous dysplasia
B: Aneurysmal bone cyst
Answer: B: Aneurysmal bone cyst 
Explanation: Ans BFluid fluid levels can be seen in both ABC and GCT but key to remember here is the age. ABC is tumour of adolescence while GCT appears only after fusion of epiphyseal plates.