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
Dense calcification is found in -a) Osteosarcomab) Chondroblastomac) Synovial sarcomad) Osteoblastoma 
Select and explain. 
A. abd, B. bcd, C. abc, D. ab
A: abd
Answer: A: abd 
Explanation: 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 of chondroid matrix, formed by benign and malignant cartilage forming tumors.