Assertion : Line segment of length 5 cm can be constructed using ruler only.
Reason : We can construct any line segment using ruler.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

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

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that a line segment of length 5 cm can be constructed using a ruler only.
- We need to determine if this statement is true or false.

2. **Analyzing the Reason**:
- The reason states that we can construct any line segment using a ruler.
- This is a general statement about the capabilities of a ruler.

3. **Evaluating the Assertion**:
- While it is true that we can draw a line segment of 5 cm using a ruler, the assertion specifies "using a ruler only."
- In practical geometry, while a ruler can be used to draw straight lines, it is often combined with other tools (like a compass) to measure specific lengths accurately.
- Therefore, the assertion that a line segment of 5 cm can be constructed using a ruler only is **false**.

4. **Evaluating the Reason**:
- The reason states that we can construct any line segment using a ruler.
- This is true because a ruler can be used to draw straight lines of any length, provided we have a way to measure that length accurately.
- Therefore, the reason is **true**.

5. **Conclusion**:
- The assertion is false, and the reason is true.
- Thus, the correct evaluation is that the assertion does not support the reason.

### Final Answer:
- Assertion: False
- Reason: True