Which of the following techniques serve the purpose of early diagnosils of diseases ?
(I) RELP
(II) PCR (III) ELISA

Options

A. I only
B. II & III only
C. I & III only
D. I & II & III

Answer

To determine which techniques serve the purpose of early diagnosis of diseases among the options given (I) RFLP, (II) PCR, and (III) ELISA, we can analyze each method step by step.

### Step-by-Step Solution:

1. **Understanding RFLP (Restriction Fragment Length Polymorphism)**:
- RFLP is a technique used to analyze the lengths of DNA fragments that have been cut by restriction enzymes.
- It is primarily used for genetic analysis and can help diagnose genetic diseases by identifying variations in DNA sequences.
- **Conclusion**: RFLP can be used for early diagnosis of genetic diseases.

2. **Understanding PCR (Polymerase Chain Reaction)**:
- PCR is a widely used technique that allows for the amplification of specific DNA sequences.
- This method is particularly useful in detecting the presence of pathogens, even in very low concentrations, making it effective for early diagnosis of infectious diseases.
- **Conclusion**: PCR is a valuable tool for early detection of diseases caused by pathogens.

3. **Understanding ELISA (Enzyme-Linked Immunosorbent Assay)**:
- ELISA is an immunological assay that detects the presence of antibodies or antigens in a sample.
- It is commonly used for diagnosing infections and diseases by identifying specific proteins associated with pathogens.
- **Conclusion**: ELISA is also effective for early diagnosis of various diseases.

4. **Final Conclusion**:
- All three techniques: RFLP, PCR, and ELISA, can be utilized for the early diagnosis of diseases.
- Therefore, the correct answer is that all options (I, II, and III) serve the purpose of early diagnosis.

### Final Answer:
All of the above techniques (I, II, and III) serve the purpose of early diagnosis of diseases.

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