user: Question: Who was the sponsor for the bill introduced February 28, 2005 with cosponsors less than 200?
Columns: ['Congress', 'Short title', 'Bill number(s)', 'Date introduced', 'Sponsor(s)', '# of cosponsors']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['111th Congress', 'Stem Cell Research Enhancement Act of 2009', 'H.R. 873', 'February 4, 2009', 'Rep. Diana DeGette (D-CO)', 113.0]
SQL:

assistant: SELECT "Sponsor(s)" FROM "Table" WHERE "# of cosponsors" < 200.0 AND "Date introduced" = 'February 28, 2005';