Name the technique by which Gene expression can be controlled with the help of RNA molecule.

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Technique**: The technique that allows for the control of gene expression using RNA molecules is known as **RNA interference (RNAi)**.

2. **Understanding RNA Interference**: RNA interference is a biological process in which RNA molecules inhibit gene expression or translation, effectively silencing targeted genes.

3. **Mechanism of Action**: In RNA interference, a specific type of RNA, often referred to as complementary RNA (cRNA), is introduced to the messenger RNA (mRNA) that corresponds to the gene we want to silence.

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