When the united states won a total number of medals larger than 25, what was the lowest amount of Bronze medals won?
CREATE TABLE "medal_table" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT MIN("bronze") FROM "medal_table" WHERE "nation"='united states' AND "total">25;