This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal Radiology, Subject name: Radiology
[{'content': 'An osteolytic mass over the iliac bone showing mottled popcorn calcifications in a 45 year old male suggests? \nSelect and explain. \nA. Osteosarcoma, B. Chondrosarcoma, C. Metastasis, D. Osteoclastoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Popcorn Calcification on Iliac Bone(Flat Bone)-CHONDROSARCOMA', 'role': 'assistant'}]