Select the correct statement regarding lactobacillus acidophilus.
A. They produce acids the coagulate and partially digest milk fat.
B. They require a suitable temperature and medium for their multiplication.
C. They play a beneficial role by checking disease-causing microbes in our stomach.
D. They improve nutritional quality by increasing the amount of thiamine .

Options

A. (A) , (B) and (C)
B. (B) and (C)
C. (B) , (C) and (D)
D. All of these

Answer

To solve the question regarding Lactobacillus acidophilus, we will evaluate each of the provided statements one by one.

### Step-by-Step Solution:

1. **Understanding Lactobacillus acidophilus**:
- Lactobacillus acidophilus is a type of lactic acid bacteria (LAB) commonly found in fermented dairy products like yogurt and curd. It plays a significant role in the fermentation process.

2. **Analyzing Statement A**:
- **Statement A**: "They produce acids that coagulate and partially digest milk fat."
- **Evaluation**: This statement is incorrect. Lactobacillus acidophilus produces acids that coagulate and partially digest milk proteins (specifically casein), not milk fat.

3. **Analyzing Statement B**:
- **Statement B**: "They require a suitable temperature and medium for their multiplication."
- **Evaluation**: This statement is correct. Lactobacillus acidophilus needs specific conditions, including temperature and a suitable medium (like milk), to grow and multiply effectively.

4. **Analyzing Statement C**:
- **Statement C**: "They play a beneficial role by checking disease-causing microbes in our stomach."
- **Evaluation**: This statement is also correct. Lactobacillus acidophilus helps maintain gut health by inhibiting the growth of pathogenic microbes.

5. **Analyzing Statement D**:
- **Statement D**: "They improve nutritional quality by increasing the amount of thiamine."
- **Evaluation**: This statement is incorrect. Lactobacillus acidophilus is known to increase the content of vitamin B12, not thiamine.

6. **Conclusion**:
- The correct statements regarding Lactobacillus acidophilus are B and C. Therefore, the correct answer is options B and C.

### Final Answer:
- The correct statements regarding Lactobacillus acidophilus are:
- B. They require a suitable temperature and medium for their multiplication.
- C. They play a beneficial role by checking disease-causing microbes in our stomach.