Table: sri_perumbudur_lsb
Columns: lok_sabha
duration
name_of_m_p
party_affiliation
election_year

Question: What is the Lok Sabha for Dravida Munnetra Kazhagam, in 1999-04?
SQL: SELECT "lok_sabha" FROM sri_perumbudur_lsb WHERE "party_affiliation" = 'dravida munnetra kazhagam' AND "duration" = '1999-04'

Question: What is the duration when Lok Sabha shows fifth?
SQL: SELECT "duration" FROM sri_perumbudur_lsb WHERE "lok_sabha" = 'fifth'