Assertion: Vitamin D cannot be stored in our body.
Reason : Vitamin D is fat soluble vitamin and is excreted out of the body with urine.

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 question regarding the assertion and reason about Vitamin D, we need to analyze both statements carefully.

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Vitamin D cannot be stored in our body."
- **Analysis**: Vitamin D is classified as a fat-soluble vitamin. Fat-soluble vitamins (like A, D, E, and K) can indeed be stored in the body's fatty tissues and liver. Therefore, this assertion is **false**.

2. **Understanding the Reason**: The reason states that "Vitamin D is a fat-soluble vitamin and is excreted out of the body with urine."
- **Analysis**: While it is true that Vitamin D is a fat-soluble vitamin, the claim that it is excreted out of the body with urine is incorrect. Fat-soluble vitamins are generally not excreted in urine; instead, they are stored in the body. Therefore, this reason is also **false**.

3. **Conclusion**: Since both the assertion and the reason are false, we can conclude that the correct answer is that both the assertion and the reason are false.

### Final Answer:
Both assertion and reason are false.