In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.

Q: who is the principal assistant to the president in all matters relating to the dod

A: Secretary of Defense
****
Q: what popular food is thought to have originated in naples italy

A: pizza
****
Q: when did the huns invade the roman empire

A:
447
****