user: Question: What position did the player play who weighed less thna 91 kg and was born on March 5, 1977?
Columns: ['Position', 'Name', 'Height (cm)', 'Weight (kg)', 'Birthdate', 'Birthplace', '1997–1998 Team']
Types: ['text', 'text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['G', 'Guy Hebert', 180.0, 84.0, 'January 7, 1967', 'Troy, New York', 'Anaheim Ducks']
SQL:

assistant: SELECT "Position" FROM "Table" WHERE "Weight (kg)" < 91.0 AND "Birthdate" = 'March 5, 1977';