This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
[{'content': 'Dense calcification is found in all except - \nSelect and explain. \nA. Osteosarcoma, B. Chondroblastoma, C. Synovial sarcoma, D. Osteoblastoma', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Synovial sarcoma* Dense, homogenous mineralization (calcification) is typical of osteoid matrix, formed by benign and malignant bone-forming lesions. However, osteoid matrix is not always mineralized.* Calcified rings and arcs, dense punctate calcification, and flocculent calcification (small, loosely aggregated masses) are pattern of mineralization ofchondroid matrix, formed by benign and malignant cartilage forming tumors. Osteoid matrixChondroid matrixBenignOsteoid, osteoma, osteoblastoma, bone islandsOsteochondroma, chondroblastoma, endochondroma, Chondromyxoid fibromaMalignantOsteosarcomaChondrosarcoma", 'role': 'assistant'}]