CREATE TABLE table_name_16 (start VARCHAR, main_host VARCHAR, winning_mentor VARCHAR)

What is the start date with Luke Jacobz hosting and Dannii Minogue as a winning mentor?
SELECT start FROM table_name_16 WHERE main_host = "luke jacobz" AND winning_mentor = "dannii minogue"
SELECT "start" FROM "table_name_16" WHERE "dannii minogue" = "winning_mentor" AND "luke jacobz" = "main_host"