Which among the following is not used for making any article?

Steel

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Cast iron

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Pig iron

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Wrought iron

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Solution

The correct option is C
Pig iron

Explanation of the correct option:
Pig iron has a very high carbon content, typically 3.8–4.7%, along with silica and other constituents of dross.
This makes it very brittle and not useful directly as a material except for limited applications.

Hence, the correct option is (C).

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