user: ### NOW ANSWER:
Question: List the number of tournament winners when Iona , Siena & Niagara won in the regular season.
Columns: ['Conference', 'Regular Season Winner', 'Conference Player of the Year', 'Conference Tournament', 'Tournament Venue (City)', 'Tournament Winner']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Atlantic 10 Conference', "St. Joseph's", 'David West , Xavier', "2001 Atlantic 10 Men's Basketball Tournament", 'The Spectrum ( Philadelphia, Pennsylvania )', 'Temple']
SQL:

assistant: SELECT COUNT("Tournament Winner") FROM "Table" WHERE "Regular Season Winner" = 'Iona , Siena & Niagara';