user: Question: Which points classification was used in stage 15?
Columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Intergiro classification', 'Trofeo Fast Team']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Mario Cipollini', 'Mario Cipollini', 'Mario Cipollini', 'not awarded', 'Dimitri Konyshev', 'Saeco']
SQL:

assistant: SELECT "Points classification" FROM "Table" WHERE "Stage" = '15';