Name the competition of panathinaikos
CREATE TABLE table_21812 (
    "Season" text,
    "Competition" text,
    "Round" text,
    "Opposition" text,
    "First Leg" text,
    "Second Leg" text,
    "Aggregate" text
)
SELECT "Competition" FROM table_21812 WHERE "Opposition" = 'Panathinaikos'
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: Name the competition of panathinaikos ### Input: CREATE TABLE table_21812 (
    "Season" text,
    "Competition" text,
    "Round" text,
    "Opposition" text,
    "First Leg" text,
    "Second Leg" text,
    "Aggregate" text
) ### Response: SELECT "Competition" FROM table_21812 WHERE "Opposition" = 'Panathinaikos'