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Which of the following cores are produced by mixing silica?

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Which of the following cores are produced by mixing silica?

(a) Green sand cores

(b) Dry sand cores

(c) Oil bonded cores

(d) Resin bonded cores

I had been asked this question in a national level competition.

This interesting question is from Types of Cores topic in division Core and Core Making of Casting-Forming-Welding I

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Right choice is (c) Oil bonded cores

Explanation: Oil bonded cores are produced by adding silica and a small amount of linseed oil, and then polymerized.

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