A: 5S rRNA and surrounding protein complex provides binding site of tRNA.
R : tRNA is soluble RNA with unsual bases.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark 1
B. If both Assertion & Reason are true and the reason is not the correct explanation of the assertion , then mark 2
C. If Assertion is true statement but Reason is false, then mark.3
D. If both Assertion and Reason are false statements, then mark 4.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "5S rRNA and surrounding protein complex provides binding site for tRNA." This means that the 5S ribosomal RNA, along with its associated proteins, plays a crucial role in the translation process by providing a site where tRNA can bind.

2. **Understanding the Role of tRNA**: The reason states that "tRNA is soluble RNA with unusual bases." This indicates that tRNA is a type of RNA that is soluble in the cellular environment and contains bases that are not commonly found in other types of RNA.

3. **Connecting the Assertion and Reason**: During translation, tRNA molecules carry amino acids to the ribosome, where they bind to the mRNA codons. The 5S rRNA and its protein complex are integral to the ribosome's structure and function, facilitating the binding of tRNA.

4. **Evaluating the Truth of the Statements**:
- The assertion is true because the 5S rRNA and surrounding proteins do provide a binding site for tRNA during translation.
- The reason is also true; tRNA is indeed a soluble RNA that contains unusual bases such as dihydrouridine and pseudouridine.

5. **Determining the Relationship**: Although both statements are true, the reason does not directly explain the assertion. The presence of unusual bases in tRNA does not specifically relate to its binding to the ribosome's 5S rRNA and protein complex.

6. **Conclusion**: Since both the assertion and reason are true, but the reason does not correctly explain the assertion, the correct answer is that both are true but the reason is not the correct explanation for the assertion.

### Final Answer:
Both assertion and reason are true, but the reason is not the correct explanation for the assertion.