Assertion: Lipases of bile help in the emulsification of fats.
Reason: Lipases can break large fat droplets into smaller ones.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reson is false.
D. If both assertion and reason are false.

Explanation

To solve the question regarding the assertion and reason about lipases and the emulsification of fats, we can break down the information step by step:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Lipases of bile help in the emulsification of fats."
- We need to verify if lipases are present in bile and if they play a role in emulsifying fats.

2. **Analyzing Bile Composition**:
- Bile is produced in the liver and stored in the gallbladder.
- The main components of bile include:
- 90% water
- Bile salts (or bile acids)
- Bile pigments (like bilirubin)
- A small percentage of fats
- Notably, lipases are not a component of bile.

3. **Function of Bile Salts**:
- The primary function of bile salts is to emulsify fats, which means breaking down large fat droplets into smaller droplets to facilitate digestion and absorption.
- Therefore, the assertion that lipases of bile help in emulsification is incorrect because bile does not contain lipases.

4. **Understanding the Reason**:
- The reason states that "Lipases can break large fat droplets into smaller ones."
- While lipases are indeed enzymes that digest fats, they do not perform the emulsification process. Instead, they act on already emulsified fats (small droplets) to break them down into fatty acids and glycerol.

5. **Conclusion**:
- Since the assertion is false (lipases are not in bile and do not help in emulsification), and the reason is also false (lipases break down small droplets, not large ones), we conclude that both the assertion and reason are incorrect.

### Final Answer:
Both assertion and reason are false. Therefore, the correct option is **Option 4**.

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