Which type of RNA is involved in the regulation of gene expression by binding to specific mRNA sequences?

A Transfer RNA (tRNA)
B Messenger RNA (mRNA)
C Ribosomal RNA (rRNA)
D MicroRNA (miRNA) ✓

Explanation

MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression by binding to specific sequences on target messenger RNAs (mRNAs), leading to their degradation or repression of translation.

Source

Molecular Cell Biology by Lodish et al.
Fundamentals of Biochemistry Biochemistry Gene Regulation Medium MEDICAL Confidence: high