What was the surface of the tournament where Anna Benzon was the opponent in the final?
CREATE TABLE table_71682 (
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Opponent in the final" text,
    "Score" text
)
SELECT "Surface" FROM table_71682 WHERE "Opponent in the final" = 'anna benzon'
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 was the surface of the tournament where Anna Benzon was the opponent in the final? ### Input: CREATE TABLE table_71682 (
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Opponent in the final" text,
    "Score" text
) ### Response: SELECT "Surface" FROM table_71682 WHERE "Opponent in the final" = 'anna benzon'