Assertion : Polysaccharides are called non-sugars.
Reason : Carbohydrates which yield a large number of monosaccharide units on hydrolysis are called polysaccharides.

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 the Assertion**: The assertion states that "Polysaccharides are called non-sugars." This implies that polysaccharides do not exhibit the sweet taste typically associated with sugars.

2. **Understanding the Reason**: The reason provided is that "Carbohydrates which yield a large number of monosaccharide units on hydrolysis are called polysaccharides." This is a definition of polysaccharides, indicating that they are complex carbohydrates that can be broken down into simpler sugars (monosaccharides) upon hydrolysis.

3. **Classification of Carbohydrates**: Carbohydrates are classified into three main categories:
- Monosaccharides (simple sugars like glucose)
- Disaccharides (two monosaccharides linked together, like sucrose)
- Polysaccharides (long chains of monosaccharides, like starch and glycogen)

4. **Hydrolysis of Polysaccharides**: When polysaccharides undergo hydrolysis, they break down into multiple monosaccharide units. For example, starch (a polysaccharide) can be hydrolyzed to yield glucose molecules.

5. **Taste and Nature of Polysaccharides**: While polysaccharides are carbohydrates, they are not sweet in taste. This is why they are referred to as "non-sugars." For instance, starch does not taste sweet even though it is a carbohydrate.

6. **Evaluating the Connection**: Both the assertion and reason are true statements. However, the reason does not directly explain why polysaccharides are considered non-sugars. The assertion is based on the taste and nature of polysaccharides, while the reason describes their chemical structure and behavior upon hydrolysis.

7. **Conclusion**: The assertion is true, and the reason is also true, but the reason does not serve as a correct explanation for the assertion. Therefore, the correct answer is that both the assertion and reason are true, but the reason is not a correct explanation for the assertion.