Mollusca's exoskeleton consists of ...?

Options :
  1. Iron oxide
  2. Calcium carbonate
  3. Calcium phosphate
  4. Copper sulphate
Answer and Explanation :-

Answer: Option 2

Explanation:

Exoskeleton of molluscs consists of calcium carbonate which is secreted by the mantle edge.

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He hesitated, remembering something Finnikin had said to him on their journey. That somehow, even in the worst of times, the tiniest fragments of good survive. It was the grip in which one held those fragments that counted.
-Melina Marchetta Finnikin of the Rock