Which of the following is a sushi roll?

The correct answer is based on the categorization of the options presented. A sushi roll typically refers to a specific preparation of sushi where ingredients such as fish, vegetables, and rice are rolled together in a sheet of seaweed (nori) and sliced into bite-sized pieces.

In this context, both the Philly roll and the California roll are indeed established types of sushi rolls. The California roll is particularly popular as it often includes ingredients like imitation crab, avocado, and cucumber, all wrapped in rice and nori. The Philly roll, featuring smoked salmon and cream cheese, is another recognized sushi variant.

The Dragon roll is also a known sushi roll that usually includes shrimp tempura and is topped with thin slices of avocado, often resembling dragon scales.

However, the term "Superman roll" does not generally have a widely accepted definition in sushi culture or menus. It may refer to a specific or specialized creation by a particular restaurant, which means it doesn’t qualify as a standard or common sushi roll like the others. Thus, among the given options, the ones fitting the standard definition of a sushi roll would be the Philly roll, the California roll, or the Dragon roll, leaving the Superman roll as an outlier.