What is a yeast roll that is rich in butter and eggs but low in sugar?

The option identifying the correct answer is a yeast roll known for its richness in butter and eggs, yet it contains a low sugar content. This description fits brioche perfectly. Brioche is a classic French bread that is light, soft, and has a buttery flavor due to the high fat content from butter and eggs. It is often used in both sweet and savory applications, showcasing its versatility.

While the other choices are also types of bread, they do not share the same profile as brioche. A baguette is characterized by its crusty exterior and airy interior but is not rich in butter or eggs. Challah, although it has a rich egg-based dough, is typically slightly sweeter than brioche and aims for its distinct braided form. Focaccia, on the other hand, is more about an olive oil-rich dough and is seasoned rather than sweetened, which sets it apart from the buttery richness of brioche. Thus, brioche emerges as the quintessential option that aligns with the description given in the question.