Which of the following is not a topping for the Cobb salad?

The Cobb salad is traditionally known for its combination of several specific ingredients, including egg, croutons, grape tomatoes, and avocado, which contribute to its distinct flavor and texture. However, croutons are not a standard topping for a traditional Cobb salad. They are more commonly associated with other salads, particularly Caesar salads, where they add a crunchy texture. The essential ingredients of a Cobb salad typically include ingredients like chopped greens, grilled chicken, bacon, blue cheese, and the other mentioned toppings, but croutons are less central to its identity. Therefore, selecting croutons as the item that does not belong highlights the distinction between the various elements that characterize traditional Cobb salads.