What is the duration when Lok Sabha shows fifth?
CREATE TABLE "members_of_the_parliament" (
  "lok_sabha" text,
  "duration" text,
  "name_of_m_p" text,
  "party_affiliation" text,
  "election_year" real
);
SELECT "duration" FROM "members_of_the_parliament" WHERE "lok_sabha"='fifth';