Match the following and choose the correct option.

	Column I		Column II
(a)	Calcareous spicules	(i)	Asterias
(b)	Calcareous ossicles	(ii)	Sycon
(c)	Chitinous exoskeleton	(iii)	Pinctada
(d)	Calcareous shell	(iv)	Aedes

	a	b	c	d
1.	i	ii	iv	iii
2.	ii	i	iv	iii
3.	ii	i	iii	iv
4.	ii	iv	i	iii

• A

  1

• B

  2

• C

  3

• D

  4