What is the Aggregate of Bayer Leverkusen opponents?
CREATE TABLE table_name_56 (
    aggregate VARCHAR,
    opponents VARCHAR
)
SELECT aggregate FROM table_name_56 WHERE opponents = "bayer leverkusen"
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: What is the Aggregate of Bayer Leverkusen opponents? ### Input: CREATE TABLE table_name_56 (
    aggregate VARCHAR,
    opponents VARCHAR
) ### Response: SELECT aggregate FROM table_name_56 WHERE opponents = "bayer leverkusen"