In lac operon concept of gene expression, allolactose acts as,

Co-repressor

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Repressor

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Co-enzyme

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Inducer

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Solution

The correct option is C Inducer
The lac operon is the inducible cluster of genes in the prokaryotes involved in the lactose metabolism. When the lactose is present, the repressor protein combines with the lactose to form allolactose. The allolactose acts as the inducer and allows the transcription to take place and the mRNA for the enzymes are formed.
Thus, the correct answer is option D.

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