Which of the following statements about gallstones is true?

Gallstones can indeed form when there is an excess of cholesterol in the bile, which leads to the crystallization of cholesterol and, consequently, the formation of stones. This process can occur when the liver produces more cholesterol than the bile can dissolve or when the gallbladder doesn't empty efficiently, allowing cholesterol to accumulate.

The mechanism of stone formation can include both cholesterol and pigment stones. Cholesterol stones are the most common type, particularly in Western populations, and they arise specifically from imbalances in the substances that make up bile. This fact underscores the role of cholesterol oversaturation in the development of gallstones, highlighting why the statement about too much cholesterol in bile contributing to gallstone formation is accurate.