How can RNA interference (RNAi) be used to experimentally reduce the expression of a specific gene in a cell?

• A. By blocking the ribosome binding site on the mRNA.
• B. By inhibiting the DNA replication process.
• C. By mutating the DNA sequence of the gene.
• D. By introducing small interfering RNAs (siRNAs) that target the mRNA of the specific gene.

Answer: (D)