What is the Yogi Bear that aired on 1959.12.21?
CREATE TABLE table_23370 (
    "N\u00ba" real,
    "Ep" real,
    "Huckleberry Hound" text,
    "Pixie and Dixie" text,
    "Yogi Bear" text,
    "Air date" text,
    "Credited animators" text
)
SELECT "Yogi Bear" FROM table_23370 WHERE "Air date" = '1959.12.21'
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 Yogi Bear that aired on 1959.12.21? ### Input: CREATE TABLE table_23370 (
    "N\u00ba" real,
    "Ep" real,
    "Huckleberry Hound" text,
    "Pixie and Dixie" text,
    "Yogi Bear" text,
    "Air date" text,
    "Credited animators" text
) ### Response: SELECT "Yogi Bear" FROM table_23370 WHERE "Air date" = '1959.12.21'