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
Type of collagen found in bone is 
Select and explain. 
A. Type 1, B. Type 2, C. Type 3, D. Type 4
A: Type 1
Answer: A: Type 1 
Explanation: Composition of bone Inorganic (Mineral) - 65% of dry weight Organic (Matrix) - 35% of dry weight Chemically it is calcium hydroxyapatite (Ca10(PO4)6(OH) 2.Collagen - Type 1 (90%)Noncollagenous protein - Osteonectin, osteocalcin, osteopontin & bone sialoprotein (Refer: Rockwood and Green's, 6th edition, pg no. 298)