What is the primary composition of bile in terms of percentage?

Bile is a complex fluid composed primarily of bile salts, phospholipids (especially lecithin), cholesterol, bilirubin, and electrolytes. In the context of the primary composition of bile, bile salts are the most significant component by percentage. Bile salts, which are derived from cholesterol, play a critical role in the emulsification of fats and the formation of micelles, facilitating digesting and absorption of lipids in the intestine.

The correct answer indicates that bile is primarily composed of 80% bile salts, 15% lecithin, and 5% cholesterol. This reflects the essential function of bile salts in digestion. Lecithin, a phospholipid, also contributes to the emulsifying properties of bile but in lesser amounts compared to bile salts. Cholesterol, while an important component, is found in relatively low concentration in bile.

While the other options present mixtures of bile components, they do not accurately represent the typical composition of bile. Specifically, the inclusion of inappropriate percentages of triglycerides or incorrect ratios of cholesterol and lecithin detracts from an accurate understanding of bile's primary constituents. Therefore, the choice that identifies bile as being predominantly made up of bile salts aligns with established biological knowledge about bile composition.