Which of the following technique is used for early detection of AIDS?

Options

A. PCR
B. ELISA
C. Widal test
D. Southern blotting

Answer

To determine which technique is used for the early detection of AIDS, we can analyze the options provided:

1. **PCR (Polymerase Chain Reaction)**: This technique is primarily used for amplifying DNA and is not specifically designed for the early detection of AIDS.

2. **ELISA (Enzyme-Linked Immunosorbent Assay)**: This is a widely used test for detecting antibodies against the HIV virus, which causes AIDS. It is effective for early detection as it can identify the presence of antibodies in the blood.

3. **VIDAL TEST**: This test is generally used for detecting certain infections and is not specific for HIV/AIDS.

4. **SADHON BLOTTING**: This is not a recognized technique for the detection of AIDS or HIV.

Based on the analysis, the correct answer is **B, ELISA**. This method is specifically designed to detect the presence of antibodies to the HIV virus, making it a crucial tool for the early diagnosis of AIDS.

### Step-by-step Solution:
1. **Identify the Techniques**: Review the options provided: PCR, ELISA, VIDAL TEST, and SADHON BLOTTING.
2. **Understand Each Technique**:
- PCR is for DNA amplification.
- ELISA is for detecting antibodies.
- VIDAL TEST is for other infections.
- SADHON BLOTTING is not relevant.
3. **Determine the Purpose**: Focus on which technique is specifically used for detecting HIV antibodies.
4. **Conclude**: ELISA is the technique that is used for the early detection of AIDS.