A bacterium which can check growth of Listeria and botulism bacteria is

Options

A. Hay bacterium
B. Methane bacterium
C. Nitrifying bacterium
D. Lactic acid bacterium.

Answer

To answer the question regarding which bacterium can check the growth of Listeria and botulism bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Bacteria in Question**:
- Listeria is caused by the bacterium *Listeria monocytogenes*, which is a rod-shaped, gram-positive bacterium.
- Botulism is caused by the toxin produced by *Clostridium botulinum*, which is also a bacterium.

2. **Examine the Options Given**:
- The options include:
- A) Hay bacterium (Bacillus subtilis)
- B) Methane bacterium (Methanobacter)
- C) Nitrifying bacterium (Nostoc)
- D) Lactic acid bacterium

3. **Evaluate Each Option**:
- **Option A: Hay Bacterium (Bacillus subtilis)**:
- This bacterium is known for its role in biotechnology and does not specifically inhibit the growth of Listeria or botulism bacteria.
- **Option B: Methane Bacterium (Methanobacter)**:
- Methanobacter is involved in methane production and does not have a role in inhibiting Listeria or botulism bacteria.
- **Option C: Nitrifying Bacterium (Nostoc)**:
- Nostoc is involved in nitrogen fixation and does not inhibit the growth of the mentioned pathogens.
- **Option D: Lactic Acid Bacterium**:
- Lactic acid bacteria are known to produce lactic acid, which can inhibit the growth of various pathogens, including Listeria and *Clostridium botulinum*.

4. **Conclusion**:
- Based on the evaluation, the correct answer is **Option D: Lactic Acid Bacterium**, as it is responsible for checking the growth of both Listeria and botulism bacteria.

### Final Answer:
The bacterium which can check the growth of Listeria and botulism bacteria is **Lactic Acid Bacterium**.