The following change is observed due to addition of hops is bear wart during fermentation

Options

A. Colour
B. Flavour
C. Mild antibacterial activity
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding Beer Production**:
- Beer is an alcoholic beverage produced through the fermentation of barley. The fermentation process involves yeast converting sugars into alcohol and carbon dioxide.

2. **Role of Hops in Beer**:
- Hops are the flowers (or seed cones) of the Humulus lupulus plant. They are added to beer during the brewing process for several reasons.

3. **Flavor Enhancement**:
- The addition of hops imparts a distinct flavor to the beer. Hops contribute a bitter taste that balances the sweetness of the malt, enhancing the overall flavor profile.

4. **Antibacterial Properties**:
- Hops possess mild antibacterial properties, which help inhibit the growth of certain bacteria during fermentation. This contributes to the preservation and shelf life of the beer.

5. **Color Improvement**:
- Hops can also influence the color of the beer, making it more visually appealing. The specific compounds in hops can enhance the beer's appearance.

6. **Conclusion**:
- Therefore, the addition of hops during fermentation results in improved flavor, increased shelf life due to antibacterial activity, and enhanced color. The correct answer to the question is that these changes are observed due to the addition of hops.