Antibiotics active against fungi are

Options

A. Neomycin
B. Terramycin
C. Polyenes
D. Streptomycin.

Explanation

### Step-by-Step Solution:

1. **Understanding Antibiotics**: Antibiotics are substances produced by microorganisms that can kill or inhibit the growth of other microorganisms. They are primarily used to treat bacterial infections, but some can also be effective against fungi.

2. **Analyzing the Options**:
- **Neomycin**: This antibiotic is known to be effective against bacteria. It is not used for fungal infections.
- **Teramycin**: Similar to neomycin, teramycin is also an antibacterial antibiotic and does not target fungi.
- **Polyenes**: This class of antibiotics is specifically designed to combat fungal infections. They work by disrupting the fungal cell membrane, making them effective against fungi.
- **Streptomycin**: Like the previous two options, streptomycin is an antibiotic that acts against bacteria and is not effective against fungi.

3. **Identifying the Correct Answer**: Based on the analysis:
- Neomycin: Incorrect (bacterial)
- Teramycin: Incorrect (bacterial)
- Polyenes: Correct (antifungal)
- Streptomycin: Incorrect (bacterial)

4. **Conclusion**: The antibiotic that is active against fungi is **Polyenes**.