Thanks to world population review for helping me as my source for this quiz. It is an awesome source, especially if you are finding cities by urban area in 2020. This quiz is made by a 2020 census and is by Urban Area.
Giza is in the metro area of Cairo, but this quiz is not by metro area. It is by Urban area and Giza is a different city than cairo in urban area. https://en.wikipedia.org/wiki/Giza