One of the following is a Deuteromycetes fungus

Options

A. Aspergillus
B. Agaricus
C. Alternaria
D. Albugo

Answer

To determine which of the given options is a Deuteromycetes fungus, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Deuteromycetes**:
- Deuteromycetes, also known as "imperfect fungi," are a group of fungi for which the sexual reproduction stage is not known. This is a key characteristic that distinguishes them from other fungal groups.

2. **Analyze the Options**:
- We need to evaluate each option provided to see which one fits the definition of Deuteromycetes.

3. **Evaluate Option 1 - Aspergillus**:
- Aspergillus is a genus of fungi that is classified under the Ascomycetes phylum. Since it belongs to Ascomycetes, it is not a Deuteromycetes fungus.

4. **Evaluate Option 2 - Agaricus**:
- Agaricus is a genus that includes edible mushrooms and is classified under the Basidiomycetes phylum. Therefore, it is also not a Deuteromycetes fungus.

5. **Evaluate Option 3 - Alternaria**:
- Alternaria is a genus of fungi that is classified under Deuteromycetes. This means it is indeed an imperfect fungus, as its sexual reproduction stage is not known.

6. **Evaluate Option 4 - Albugo**:
- Albugo is a genus of fungi that is known to be parasitic and belongs to the Phycomycetes group. Thus, it is not a Deuteromycetes fungus.

7. **Conclusion**:
- Based on the analysis, the correct answer is **Option 3 - Alternaria**, as it is the only one that belongs to the Deuteromycetes group.

### Final Answer:
The Deuteromycetes fungus among the options is **Alternaria**.