user: Question: Which group has a weight (kg) less than 55?
Columns: ['Result', 'Date', 'Race', 'Venue', 'Group', 'Distance', 'Weight (kg)', 'Jockey', 'Winner/2nd']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Won', '26 Aug 2006', 'Ian McEwen Trophy', 'Moonee Valley', 'G3', '1000 m', 55.0, 'C. Newitt', '2nd - Sassbee']
SQL:

assistant: SELECT "Group" FROM "Table" WHERE "Weight (kg)" < 55.0;