Matrix of bone is composed of
a)	Chondrin	b)	Ossein	c)	Osteon	d)	Auxin

(b)

The intercellular substance of bone is hard and dense. About 35% to 38% part of matrix of bone is organic mainly containing bone protein ossein. About 60% to 65% part of matrix is inorganic referred as hydroxyapatite; mainly containing calcium and phosphorus.