Perhaps it's because of their shape (although the test writers should note, few pies form an exact circle), or maybe just because of the universality of the food itself. Whatever the reason, I hope no pizza related questions appear on the actual exam. Otherwise my stomach might start growling and once I start day dreaming about pizza, it will be all downhill.
The following question (click to enlarge) pays tribute to the Sicilian slice. See if you can solve it: