Bile salts, bile pigments, gall bladder, gastric juice

Explanation

**Step-by-Step Solution:**

1. **Identify the Components:**
- The question lists four components: bile salts, bile pigments, gall bladder, and gastric juice.

2. **Understand the Function of Each Component:**
- **Bile Salts:** These are produced by the liver and are important for the emulsification and digestion of fats.
- **Bile Pigments:** These are also produced by the liver and include bilirubin, which is responsible for the yellow color of bile.
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