Assertion : Toddy becomes unpalatable after 24 hours.
Reason : The fermentation of toddy is continued by naturally occuring yeasts.

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

**Step-by-Step Solution:**

1. **Understanding Toddy**:
- Toddy is a fermented beverage made from the sap of palm trees. It is known for its alcoholic content, which is a result of fermentation.

2. **Assertion Analysis**:
- The assertion states that "Toddy becomes unpalatable after 24 hours." This means that after a certain period, the taste of toddy deteriorates to a point where it is no longer enjoyable to drink.

3. **Reason Analysis**:
- The reason provided is that "The fermentation of toddy is continued by naturally occurring yeasts." This explains the process behind the fermentation of toddy, indicating that yeast present in the environment contributes to the fermentation process.

4. **Fermentation Process**:
- During fermentation, sugars in the sap are converted into alcohol by yeast. Initially, the alcohol content in toddy is around 6%. However, as fermentation continues, the production of acetic acid increases.

5. **Impact of Acetic Acid**:
- After 24 hours, the acetic acid concentration in the toddy can rise to about 4-5%. This increase in acetic acid contributes to the sour taste of the beverage, making it unpalatable.

6. **Conclusion**:
- Both the assertion and the reason are correct. The assertion that toddy becomes unpalatable after 24 hours is true, and the reason that fermentation is continued by naturally occurring yeasts is also true. Furthermore, the reason provides a correct explanation for the assertion.

7. **Final Answer**:
- Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.