What type of bread is in a classic peanut butter and jelly sandwich?

What is it that makes a peanut butter and jelly sandwich so perfect? It's the interplay between each of its ingredients. First, there's the pillowy white bread. The texture of the white bread is followed by the rich and crunchy peanut butter, which threatens to dry out your mouth until some sweet, sharp, restorative jelly comes along.

Source: mob