CREATE TABLE table_name_18 (sponsor_s_ VARCHAR(255), _number_of_cosponsors VARCHAR(255), date_introduced VARCHAR(255))
Who was the sponsor for the bill introduced February 28, 2005 with cosponsors less than 200?
    
SQL: SELECT sponsor_s_ FROM table_name_18 WHERE _number_of_cosponsors < 200 AND date_introduced = "february 28, 2005"