One amongst the following is not a PCR application :

Options

A. Detection of syphlis
B. Study of cause of congenital disease
C. Detection of hepatitis
D. Treatment against SCID

Answer

To determine which option is not a PCR application, we can follow these steps:

### Step-by-Step Solution:

1. **Understand PCR**: PCR (Polymerase Chain Reaction) is a technique used to amplify small segments of DNA, creating millions of copies from a small initial sample. This process is known as DNA amplification.

2. **Identify Common Applications of PCR**:
- **Diagnosis of Pathogens**: PCR is widely used in medical diagnostics to detect the presence of pathogens (bacteria, viruses, etc.) in a sample.
- **Mutation Detection**: PCR can be used to identify mutations in genes, which is important in genetic studies and cancer research.
- **DNA Fingerprinting**: This technique is used in forensic science to identify individuals based on their unique DNA profiles.
- **Detection of Specific Diseases**: PCR can help in diagnosing specific genetic disorders or diseases by detecting specific DNA sequences.

3. **Analyze the Given Options**:
- We need to look at the options provided in the question and identify which one does not fit into the applications of PCR.
- One of the options is "treatment against SCID (Severe Combined Immunodeficiency)".

4. **Determine the Correct Answer**:
- While PCR is useful for diagnosing SCID, it is not a treatment method. Therefore, the option related to "treatment against SCID" is the one that does not represent a PCR application.

5. **Conclusion**:
- The correct answer is the option that states "treatment against SCID", as PCR is not used for treatment but rather for diagnosis.

### Final Answer:
The option that is not a PCR application is "treatment against SCID".

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