VITRO is to GLASS as LIGNO is to
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STEEL
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CEMENT
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WOOD
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GRANITE
C
Correct answer
Explanation
This is an analogy question. Vitro is a prefix relating to glass (as in 'vitroceramic'). Similarly, Ligno is a prefix relating to wood (from 'lignin', the organic polymer in wood). Just as vitro-glass combinations involve glass, ligno-wood combinations involve wood.