Assertion : Use of aspartame is limited to cold foods and soft drinks
Reason : Aspartame is rougly 100 times as sweet as cane sugar .

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 both assertion and reason are false.

Explanation

To solve the assertion-reason question, we will analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion:**
- The assertion states that "the use of aspartame is limited to cold foods and soft drinks."
- We need to evaluate whether this statement is true or false.

2. **Understanding the Reason:**
- The reason states that "aspartame is roughly 100 times as sweet as cane sugar."
- We need to determine if this statement is true and if it relates to the assertion.

3. **Analyzing Aspartame:**
- Aspartame is an artificial sweetener that is indeed about 100 times sweeter than cane sugar.
- However, it has a significant drawback: it is unstable at high temperatures.

4. **Connecting the Assertion and Reason:**
- The assertion is true because aspartame is primarily used in cold foods and soft drinks due to its instability when heated.
- The reason is also true, as aspartame is much sweeter than cane sugar.
- However, the reason does not explain why the assertion is true; the limitation to cold foods is due to its thermal instability, not just its sweetness.

5. **Conclusion:**
- Both the assertion and the reason are correct statements.
- However, the reason does not provide a correct explanation for the assertion.
- Therefore, the correct option is that both statements are true, but the reason is not the correct explanation for the assertion.

### Final Answer:
- The correct option is **B**: Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion.