Assertion :- Products of digestion are absorbed in the small intestine.
Reason:- Large intestine has impermeable wall.

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.

Answer

### Step-by-Step Solution

1. **Understanding the Assertion**: The assertion states that "Products of digestion are absorbed in the small intestine." This is a true statement. The small intestine is the primary site for nutrient absorption in the digestive system. It has specialized structures such as villi and microvilli that increase the surface area for absorption.

**Hint**: Recall the role of the small intestine in digestion and absorption.

2. **Understanding the Reason**: The reason provided is that "Large intestine has impermeable wall." This statement is false. The large intestine does not have an impermeable wall; rather, it is capable of absorbing water, electrolytes, and some vitamins produced by gut bacteria.

**Hint**: Consider the functions of the large intestine, especially regarding absorption.

3. **Evaluating the Relationship**: The assertion is true, but the reason is false. The reason does not correctly explain the assertion because the absorption of digestion products primarily occurs in the small intestine, not because of the properties of the large intestine.

**Hint**: Think about how the absorption processes in the small and large intestines differ.

4. **Choosing the Correct Option**: Based on the evaluation, the correct conclusion is that the assertion is true, but the reason is false. Therefore, the correct answer is that the assertion is true but the reason is false.

**Hint**: Review the options carefully to find the one that matches your conclusion.

### Final Answer
The correct option is: Assertion is true but reason is false.

---