What is the title of the episode with production code 3x5402?
CREATE TABLE "table1_24938621_2" (
  "no" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);
SELECT "title" FROM "table1_24938621_2" WHERE "production_code"='3X5402';