CREATE TABLE table_38381 ("Series Ep." TEXT, "Episode" FLOAT, "Segment A" TEXT, "Segment B" TEXT, "Segment C" TEXT, "Segment D" TEXT)

What is the Segment A entry for the episode that has an entry of Diesel filters for Segment D?
SELECT "Segment A" FROM table_38381 WHERE "Segment D" = 'diesel filters'
SELECT "Segment A" FROM "table_38381" WHERE "Segment D" = 'diesel filters'