Who directed the episode whose production code is 2m5901?
CREATE TABLE "table1_27969432_4" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production" text,
  "u_s_viewers_in_millions" text
);
SELECT "directed_by" FROM "table1_27969432_4" WHERE "production"='2M5901';