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': 'The most probable diagnosis of the lesion depicted in the X-ray below is (GCT) \nSelect and explain. \nA. Simple bone cyst, B. Osteoma, C. Ewings tumour, D. Osteoclastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Osteoclastoma 98% cases are benign with potential for metastasis with female predominance Sites - Distal femur/proximal tibia, lower end of radius, proximal humerus Occurrence - 20 - 40 years Arises from epiphysis Egg shell crackling on palpation X ray finding - Soap bubble appearance HPE - mesenchymal stromal cells Treatment Lower end of femur/Upper end of tibia - Excision with turn-o-plasty Veebra - Radiation Ref: Maheshwari 6e pg 237.', 'role': 'assistant'}]