Assertion : Cyclosporin A is antifungal and immunosup-pressive medicine
Reason : It stimulates the activation of T - cells and Prevents rejections.

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that "Cyclosporin A is an antifungal and immunosuppressive medicine."
- Cyclosporin A is indeed derived from the fungus Trichoderma polyspora and is primarily known for its immunosuppressive properties, especially in organ transplantation to prevent graft rejection.

2. **Evaluating the Reason:**
- The reason given is that "It stimulates the activation of T-cells and prevents rejections."
- However, the role of Cyclosporin A is to inhibit T-cell activation, not stimulate it. It works by suppressing the immune response, particularly by inhibiting the synthesis of interleukin-2, which is crucial for T-cell proliferation.

3. **Conclusion on Truthfulness:**
- Since the assertion is true (Cyclosporin A is an antifungal and immunosuppressive medicine) but the reason is false (it does not stimulate T-cell activation), we conclude that the assertion is correct while the reason is incorrect.

4. **Final Answer:**
- The correct answer is that the assertion is true, but the reason is false.