Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called?

Explanation

### Step-by-Step Solution:

1. **Identify the Sugar Present in Milk**:
- The sugar found in milk is called **lactose**. It is commonly referred to as "milk sugar".

2. **Determine the Number of Monosaccharide Units in Lactose**:
- Lactose is classified as a **disaccharide**, which means it is composed of **two monosaccharide units**. The two monosaccharides that make up lactose are **beta-D-galactose** and **beta-D-glucose**.

...