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
A solitary bone cyst is most common in the - 
Select and explain. 
A. Upper end of humerus, B. Lower end of humerus, C. Upper end of fibula, D. Lower end of femur
A: Upper end of humerus
Answer: A: Upper end of humerus 
Explanation: Simple bone cysts commonly occurs at metaphysis of long bones.
Most common site is proximal humerus (55%), followed by proximal femur (26%).