user: Question: How many rankings did the 5th season have?
Columns: ['Season', 'Timeslot', 'Season Premiere', 'Season Finale', 'Episodes', 'TV Season', 'Ranking', 'Viewers (in millions)']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['1st', 'Friday 10:00pm', 'January 23, 2005', 'May 13, 2005', 13.0, '2004–2005', '#36', '10.77']
SQL:

assistant: SELECT COUNT("Ranking") FROM "Table" WHERE "Season" = '5th';