CREATE TABLE table_204_761 (id DECIMAL, "rank" DECIMAL, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

which nation has won the most silver medals in the biathlon at the winter paralympics ?
SELECT "nation" FROM table_204_761 ORDER BY "silver" DESC LIMIT 1
SELECT "nation" FROM "table_204_761" ORDER BY "silver" DESC NULLS LAST LIMIT 1