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
[{'content': 'A lady Dimple has a lytic lesion in X-Ray of upper end of humerus. The diagnosis is, \nSelect and explain. \nA. Osteosarcoma, B. Osteochondroma, C. Unicarmel bone cyst, D. Osteoclastoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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).', 'role': 'assistant'}]