I'm unsure in what region Barysaw is the second largest city in Belarus.
I believe it should be Gomel.
[Tried to find one, only one I found is Wikipedia where Barysaw is 2nd largest in Minsk region - not all of Belarus, in case that is where the mistake is.]
Think you need to quote a source. There are some dubious answers here (the UK being the obvious one for me: Birmingham is, according to virtually every source I've seen, the second city of the UK).
Fixed. I made this quiz five years ago initially so I can't remember what source I used back then. Trying to find a source that is accurate and universal on metro areas is an ongoing project at this time.
I believe it should be Gomel.
[Tried to find one, only one I found is Wikipedia where Barysaw is 2nd largest in Minsk region - not all of Belarus, in case that is where the mistake is.]
The second biggest should be Gomel indeed