This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
[{'content': "Patient aged 30 yr presented with swelling around knee Aspirate shows giant cells and mononuclear cells Most likely diagnosis is \nSelect and explain. \nA. Gaint cell tumour, B. Osteosarcoma, C. Chondroblastoma, D. Ewing's sarcoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Giant cells present in i Gaint cell tumor= epilphyseal tumour ii Chondroblastoma REF : MAHESWARI 9TH ED', 'role': 'assistant'}]