Which class has a year prior to 2011 and audi r15 tdi as the chassis?
CREATE TABLE table_name_72 (
    class VARCHAR,
    year VARCHAR,
    chassis VARCHAR
)
SELECT class FROM table_name_72 WHERE year < 2011 AND chassis = "audi r15 tdi"
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: Which class has a year prior to 2011 and audi r15 tdi as the chassis? ### Input: CREATE TABLE table_name_72 (
    class VARCHAR,
    year VARCHAR,
    chassis VARCHAR
) ### Response: SELECT class FROM table_name_72 WHERE year < 2011 AND chassis = "audi r15 tdi"