Assertion` :` LUBB (First Sound) is of shorter duration and sharp sound.
Reason `:` It is created by the closure of the semiluar valves.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

To solve the question, we need to evaluate both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "LUBB (First Sound) is of shorter duration and sharp sound."
- This is true. The first heart sound (LUBB) is indeed characterized by a shorter duration and a sharper quality compared to the second sound (DUBB).

2. **Understanding the Reason**:
- The reason states that "It is created by the closure of the semilunar valves."
- This is false. The first heart sound (LUBB) is actually produced by the closure of the atrioventricular valves (the tricuspid and bicuspid valves), not the semilunar valves. The semilunar valves are responsible for the second heart sound (DUBB).

3. **Conclusion**:
- Since the assertion is true and the reason is false, the correct relationship is that the assertion is correct, but the reason is incorrect.

4. **Final Answer**:
- The correct option is that the assertion is true and the reason is false.