The more common sugar present in milk is
(a) fructose
(b) glucose
(c) Lactose
(d) sucrose

Options

A. fructose
B. glucose
C. galactose
D. sucrose

Answer

To determine the more common sugar present in milk, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Sugars Listed**: The options provided are fructose, glucose, lactose, and sucrose. We need to evaluate which of these sugars is most commonly found in milk.

2. **Understand the Composition of Milk**: Milk contains various components, including proteins, fats, vitamins, and sugars. Among the sugars, lactose is a significant component.

3. **Define Lactose**: Lactose is a disaccharide sugar, which means it is composed of two monosaccharides. In the case of lactose, it is made up of glucose and galactose.

4. **Glycosidic Linkage**: The two monosaccharides in lactose are linked by a specific type of bond known as a glycosidic linkage. In lactose, this is a beta 1,4 glycosidic linkage.

5. **Proportion of Lactose in Milk**: Lactose constitutes about 2 to 8 percent of the total weight of milk, making it a significant sugar present in this liquid.

6. **Lactose Digestion**: In mammals, lactose is digested by an enzyme called lactase. This enzyme breaks down lactose into its constituent monosaccharides, glucose and galactose.

7. **Conclusion**: Based on the information gathered, the most common sugar present in milk is lactose.

### Final Answer:
(c) Lactose

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