`B_(2)` is got from:

Options

A. Acetobacter
B. Bacillus megaterium
C. Ashbya gossypii
D. Pseudomonas

Answer

### Step-by-Step Solution:

1. **Identify Vitamin B2**:
- Vitamin B2 is also known as Riboflavin. It is a water-soluble vitamin that plays a crucial role in energy production and the metabolism of fats, drugs, and steroids.

2. **Analyze the Options**:
- The question provides four options from which we need to determine the source of Vitamin B2.

3. **Evaluate Option 1: Acetobacter**:
- Acetobacter is a genus of bacteria known for converting ethanol to acetic acid in the presence of oxygen. It is not associated with the production of Vitamin B2.
- **Conclusion**: This option is incorrect.

4. **Evaluate Option 2: Bacillus Megaterium**:
- Bacillus Megaterium is a type of bacteria used in the production of synthetic penicillin and antibiotics. It does not produce Vitamin B2.
- **Conclusion**: This option is also incorrect.

5. **Evaluate Option 3: Aspiogosapy**:
- Aspiogosapy refers to a type of fungus that is known to produce Vitamin B2 (Riboflavin). This is the correct source of Vitamin B2.
- **Conclusion**: This option is correct.

6. **Evaluate Option 4: Pseudomonas**:
- Pseudomonas is a genus of bacteria that can cause infections, particularly in the lungs. It is not involved in the production of Vitamin B2.
- **Conclusion**: This option is incorrect.

7. **Final Answer**:
- Based on the evaluations, the correct answer is that Vitamin B2 (Riboflavin) is obtained from **Aspiogosapy** (fungi).