what are all the nations that competed?
united states, russia, australia, china, germany, japan, netherlands, great britain, ukraine, italy, canada, hungary, spain, poland, france, finland, belarus, czech republic, slovakia, denmark, croatia, romania, bulgaria, mexico, serbia and montenegro, south africa, sweden, tunisia
which of those ranked 1-5?
united states, russia, australia, china, germany
which won the the largest number of bronze medals?
china