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
[{'content': "Radiological investigation shows sun ray appearance;diagnosis is - \nSelect and explain. \nA. Osteosarcoma, B. GCT, C. Osteomyelitis, D. Ewing's sarcoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: In exams like AIIMS and AI, only best option has to be chosen and here osteosarcoma is best option.', 'role': 'assistant'}]