Who was the opposing team in the game with a score of 21-17?
CREATE TABLE table_79143 (
    "Date" text,
    "Bowl Game" text,
    "Big Ten Team" text,
    "Opp. Team" text,
    "Score" text
)
SELECT "Opp. Team" FROM table_79143 WHERE "Score" = '21-17'
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 opposing team in the game with a score of 21-17? ### Input: CREATE TABLE table_79143 (
    "Date" text,
    "Bowl Game" text,
    "Big Ten Team" text,
    "Opp. Team" text,
    "Score" text
) ### Response: SELECT "Opp. Team" FROM table_79143 WHERE "Score" = '21-17'