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 the upper end of the humerus. The diagnosis is - \nSelect and explain. \nA. Osteosarcoma, B. Osteochondroma, C. Unicameral bone cyst, D. Osteoclastoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Amongst the given options, unicameral bone cyst arises commonly in proximal humerus.', 'role': 'assistant'}]