What is the Segment A entry for the episode that has an entry of Diesel filters for Segment D?
CREATE TABLE table_name_91 (
    segment_a VARCHAR,
    segment_d VARCHAR
)
SELECT segment_a FROM table_name_91 WHERE segment_d = "diesel filters"
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 Segment A entry for the episode that has an entry of Diesel filters for Segment D? ### Input: CREATE TABLE table_name_91 (
    segment_a VARCHAR,
    segment_d VARCHAR
) ### Response: SELECT segment_a FROM table_name_91 WHERE segment_d = "diesel filters"