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: Radiology
A lady Dimple has a lytic lesion in X-Ray of upper end of humerus. The diagnosis is, 
Select and explain. 
A. Osteosarcoma, B. Osteochondroma, C. Unicarmel bone cyst, D. Osteoclastoma
C: Unicarmel bone cyst
Answer: C: Unicarmel bone cyst 
Explanation: C i.e. Unicameral bone cyst Simple/Solitary/Unicameral Bone cyst nearly always occurs during first two decades of life, mostly in metaphysis of proximal humerus (50%) or femur with a male predominance (Male-female ratio = 2:1).