This is more of a wording thing, because the answer is still right, but I think it should be in the past tense now that the mentioned event has happened.
I think it should be changed to:
Which country hosted the 2018 FIFA World Cup?
This is more of a wording thing, because the answer is still right, but I think it should be in the past tense now that the mentioned event has happened.
I think it should be changed to:
Which country hosted the 2018 FIFA World Cup?