CREATE TABLE table_5992 ("Player" TEXT, "Team" TEXT, "Date" TEXT, "Opponent" TEXT, "Venue" TEXT)

Which team did the Boston Beaneaters host at the South End Grounds?
SELECT "Opponent" FROM table_5992 WHERE "Venue" = 'south end grounds'
SELECT "Opponent" FROM "table_5992" WHERE "Venue" = 'south end grounds'