Assertion : Tiger is rare species .
Reason : Tiger population is very small .

Options

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

Answer

To analyze the assertion and reason provided in the question, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Tiger is a rare species."
- We need to determine if this statement is true or false.

2. **Defining Rare Species**:
- Rare species are typically defined as those that are rarely found or observed in nature.
- They usually have very small populations and are not commonly seen.

3. **Analyzing the Tiger's Status**:
- The tiger is classified as an endangered species, not a rare species.
- Endangered species are those at risk of extinction, meaning their population is declining but not necessarily extremely small.

4. **Understanding the Reason**:
- The reason states that "Tiger population is very small."
- While the tiger population is indeed small compared to its historical numbers, it is not classified as "very small."

5. **Conclusion on Assertion and Reason**:
- Since the assertion that "Tiger is a rare species" is false (it is endangered, not rare), and the reason that "Tiger population is very small" is also misleading (it is small but not critically low), we conclude that both statements are false.

6. **Final Answer**:
- Therefore, the correct option is that both the assertion and reason are false.