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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It's such a stupid question, in my opinion. I mean, how do you know what you're going to do till you do it? The answer is, you don't. I think I am, but how do I know? I swear it's a stupid question.
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