Not only are these "similar", but the majority have the name of the country within the name of the capital. "Similar" would be the one you eliminated from the start: Algiers/Algeria.
That is true. However, it's quite hard to draw the line or find the best explanation in the title. Having looked further into this, I find it fair to add Algeria to the quiz as well. Algiers in other languages can actually be very close to Algeria.