In RNAi, genes are silenced using

Options

A. ss DNA
B. ds DNA
C. ds RNA
D. ss RNA

Explanation

**Step-by-Step Solution:**

1. **Understanding RNA Interference (RNAi):** RNA interference is a biological process where specific genes are silenced, preventing their expression. This mechanism is crucial for regulating gene activity and defending against viral infections.

2. **Role of Double-Stranded RNA (dsRNA):** In RNAi, the silencing of genes occurs through the action of double-stranded RNA. This dsRNA is complementary to the target mRNA (messenger RNA) of the gene that needs to be silenced.

3. **Mechanism of Action:** The double-stranded RNA is processed by an enzyme called Dicer, which cuts the dsRNA into smaller fragments known as small interfering RNAs (siRNAs). These siRNAs then incorporate into a protein complex called the RNA-induced silencing complex (RISC).

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