Which of the following is a regulatory gene?

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Question

(A) In the $Lac$ operon model,the $i$ gene codes for the repressor protein.This repressor protein binds to the operator region and prevents transcript

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$i$ gene

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(A) In the $Lac$ operon model,the $i$ gene codes for the repressor protein.This repressor protein binds to the operator region and prevents transcription of the structural genes.Therefore,the $i$ gene is known as the regulatory gene.The $Lac \,z$,$Lac \,y$,and $Lac \,a$ genes are structural genes that code for $\beta$-galactosidase,permease,and transacetylase,respectively.

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