Question: Who won Miss Universe Philippines when the first runner-up was Danielle Castaño and Janina San Miguel won Binibining Pilipinas-World?
SQL: SELECT "Miss Universe Philippines" FROM "2-1825751-4" WHERE "First runner-up" = 'Danielle Castaño' AND "Binibining Pilipinas-World" = 'Janina San Miguel';

Question: Who won Miss Universe Philippines when Regina Hahn was second runner-up?
SQL: SELECT "Miss Universe Philippines" FROM "2-1825751-4" WHERE "Second runner-up" = 'Regina Hahn';

Question: When Bianca Manalo won Miss Universe Philippines who was the second runner-up?
SQL: SELECT "Second runner-up" FROM "2-1825751-4" WHERE "Miss Universe Philippines" = 'Bianca Manalo';