This is the first question of 'The Impossible Quiz.'
The first possible answer on one is four
The second possible answer to one is 'two'.
The third possible answer to one is 'three'.
The fourth possible answer to one is 'four'.
Real Answer Edit
The real answer is four as in A POLO there is four holes. One in a, one in p, and there is two o's. The most common answer, without thinking, is one.