What topping is specifically mentioned for the chicken parm sandwich?

The chicken parm sandwich is specifically highlighted for its topping of shredded parm/Asiago. This topping is a fundamental characteristic of the dish, contributing to its signature flavor profile. Shredded parm/Asiago adds a rich, savory note that complements the breaded chicken, enhancing the overall taste experience of the sandwich.

In the context of the different toppings suggested in the other choices, mushroom, pineapple, and blue cheese sauce do not align with the traditional composition of a chicken parm sandwich. While each of those toppings could be delicious in other culinary contexts, they do not reflect the classic, recognizable toppings typically associated with a chicken parm sandwich. The focus on shredded parm/Asiago signifies the authentic preparation style that makes this sandwich distinctive.