who is the only wrestler to have only 1 combined day ?
CREATE TABLE table_204_721 (
    id number,
    "rank" number,
    "wrestler" text,
    "no. of reigns" number,
    "combined\ndefenses" number,
    "combined\ndays" number
)
SELECT "wrestler" FROM table_204_721 WHERE "combined\ndays" = '1'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: who is the only wrestler to have only 1 combined day ? ### Input: CREATE TABLE table_204_721 (
    id number,
    "rank" number,
    "wrestler" text,
    "no. of reigns" number,
    "combined\ndefenses" number,
    "combined\ndays" number
) ### Response: SELECT "wrestler" FROM table_204_721 WHERE "combined\ndays" = '1'