What is the Taco Bell item that serves as a side dish, often paired with nachos?

The correct answer is refried beans, as they are commonly served as a side dish at Taco Bell and are frequently paired with nachos to complement the flavors and provide additional texture. Refried beans offer a creamy and savory element that enhances the overall nacho experience, making them a popular choice among customers.

Loaded nacho fries, while they are a beloved menu item, are not typically considered a side dish for nachos but rather a standalone item. Pico de gallo, being a fresh salsa, adds flavor but is usually used as a topping rather than a side. Guacamole serves as a flavorful dip and is delicious with nachos, but refried beans are more traditional in this pairing, making them the primary side dish option at Taco Bell.