Assertion (A): Organ transplantation patients are given immunosuppressive drugs.
Reason (R): Transplanted tissue has antigens which stimulate the specific immune response in the recipient.

Options

A. (a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion, then mark a.
B. (b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion, then mark b.
C. (c) If Assertion is true statement but Reason is false, then mark c.
D. (d) If both Assertion and Reason are false statements, then mark d.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that organ transplantation patients are given immunosuppressive drugs.
- This is true because patients who receive organ transplants need these drugs to prevent their immune system from rejecting the new organ.

2. **Understanding the Reason**:
- The reason provided is that transplanted tissue has antigens which stimulate the specific immune response in the recipient.
- This is also true. When an organ is transplanted, the recipient's immune system recognizes the antigens on the donor tissue as foreign, which can trigger an immune response.

3. **Linking Assertion and Reason**:
- The reason explains why the assertion is true. The presence of foreign antigens in transplanted organs can lead to immune rejection, which is why immunosuppressive drugs are necessary to suppress the immune response.

4. **Conclusion**:
- Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is that both statements are true and the reason is the correct explanation for the assertion.

### Final Answer:
- Both the assertion and reason are true, and the reason is the correct explanation for the assertion.