Who was against the opponents, m d lina gojnea monica niculescu?
CREATE TABLE table_56731 (
    "Edition" real,
    "Zone" text,
    "Round" text,
    "Date" text,
    "Against" text,
    "Surface" text,
    "Partner" text,
    "Opponents" text,
    "Result" text
)
SELECT "Against" FROM table_56731 WHERE "Opponents" = 'mădălina gojnea monica niculescu'
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 was against the opponents, m d lina gojnea monica niculescu? ### Input: CREATE TABLE table_56731 (
    "Edition" real,
    "Zone" text,
    "Round" text,
    "Date" text,
    "Against" text,
    "Surface" text,
    "Partner" text,
    "Opponents" text,
    "Result" text
) ### Response: SELECT "Against" FROM table_56731 WHERE "Opponents" = 'mădălina gojnea monica niculescu'