Bile secretion is proportional to the concentration of
(a) proteins
(b) fats
(c) carbohydrates
(d) none of these

Options

A. proteins
B. fats
C. carbohydrates
D. none of these

Explanation

To determine the correct answer to the question regarding the proportionality of bile secretion, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Bile Secretion**: Bile is a digestive fluid produced by the liver and stored in the gallbladder. It plays a crucial role in the digestion and absorption of fats.

2. **Components of Bile**: Bile contains bile salts, which are essential for emulsifying fats. Emulsification is the process that breaks down large fat globules into smaller ones, making it easier for enzymes to digest them.

3. **Factors Affecting Bile Secretion**: The secretion of bile is influenced by the presence of certain substances in the intestine. Among these, fats are the most significant. When fats enter the small intestine, they stimulate the release of bile from the gallbladder.

4. **Identifying the Correct Option**: The question asks which substance bile secretion is proportional to. Since bile is primarily involved in the digestion of fats, the concentration of fats in the intestine directly affects the amount of bile that is secreted.

5. **Conclusion**: Therefore, the correct answer to the question is (b) fats, as bile secretion is proportional to the concentration of fats in the digestive system.

### Final Answer:
(b) fats