Bacteria are used in the production of
I. Alcohol
II. Cheese
III. Yoghurt

Options

A. I only
B. II and III
C. I and III
D. I, II and III

Explanation

To determine which products bacteria are used in the production of, we will analyze each option provided:

1. **Alcohol**:
- Alcohol is primarily produced through the fermentation process, which is mainly carried out by yeast, a type of fungus, rather than bacteria. Therefore, bacteria are not used in the production of alcohol.

2. **Cheese**:
- The production of cheese involves the use of bacteria, specifically Lactobacillus. This bacterium helps in the fermentation of milk, leading to the formation of curds, which is essential in cheese-making.

3. **Yoghurt**:
- Similar to cheese, yoghurt is also produced using Lactobacillus bacteria. These bacteria ferment the lactose in milk, producing lactic acid, which gives yoghurt its characteristic tangy flavor and thick texture.

Based on this analysis, we can conclude that bacteria are used in the production of cheese and yoghurt, but not in the production of alcohol.

**Final Answer**: Bacteria are used in the production of II. Cheese and III. Yoghurt.