This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy and physiology of bone and fracture healing, Subject name: Orthopaedics
what Type of collagen is found in bone ? 
Select and explain. 
A. Type 1, B. Type 2, C. Type 3, D. Type 4
A: Type 1
Answer: A: Type 1 
Explanation: Type 1 collagen fibres,derived from tropocollagen molecules produced by osteoblasts,make up over 80 percent of unmineralized matrix. They form a network which emboides a mucopolysaccharide(proteoglycans)ground substance and also acts as a scaffold on which the mineral component-crystalline hydroxyapatite is deposited. ref: apley&;s textbook,9th edition page no.118