Which of the following has minimum pH?

Options

A. (a) Bile
B. (b) Gastric juice
C. (c) Saliva
D. (d) Pancreatic juice

Explanation

To determine which biological fluid has the minimum pH among bile, gastric juice, saliva, and pancreatic juice, we can follow these steps:

### Step-by-Step Solution:

1. **Understand pH Scale**:
- The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 indicate acidity, while values above 7 indicate alkalinity.

2. **Identify pH of Each Fluid**:
- **Bile Juice**: The pH of bile juice ranges from 7 to 8, making it alkaline due to the presence of bile salts.
- **Gastric Juice**: The pH of gastric juice is around 1.8 to 2, which is highly acidic due to hydrochloric acid.
- **Saliva**: The pH of saliva is approximately 6.7, which is slightly acidic.
- **Pancreatic Juice**: The pH of pancreatic juice ranges from 6.4 to 6.8, also slightly acidic.

3. **Compare pH Values**:
- Bile Juice: 7-8 (alkaline)
- Gastric Juice: 1.8-2 (highly acidic)
- Saliva: 6.7 (slightly acidic)
- Pancreatic Juice: 6.4-6.8 (slightly acidic)

4. **Determine the Minimum pH**:
- Among the values identified, gastric juice has the lowest pH (1.8 to 2), indicating it is the most acidic fluid.

5. **Conclusion**:
- Therefore, the biological fluid with the minimum pH is **gastric juice**.

### Final Answer:
The correct answer is **Option B: Gastric Juice**.

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