Who was the opponent at Baum Stadium on April 6?
CREATE TABLE table_name_90 (
    opponent VARCHAR,
    site_stadium VARCHAR,
    date VARCHAR
)
SELECT opponent FROM table_name_90 WHERE site_stadium = "baum stadium" AND date = "april 6"
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 the opponent at Baum Stadium on April 6? ### Input: CREATE TABLE table_name_90 (
    opponent VARCHAR,
    site_stadium VARCHAR,
    date VARCHAR
) ### Response: SELECT opponent FROM table_name_90 WHERE site_stadium = "baum stadium" AND date = "april 6"