user: Question: What is the general classification at stage 18 that has a points classification of Tony Rominger?
Columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Trofeo Fast Team']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Mario Cipollini', 'Mario Cipollini', 'Mario Cipollini', 'Giuseppe Guerini', 'Mercatone Uno-Saeco']
SQL:

assistant: SELECT "General classification" FROM "Table" WHERE "Points classification" = 'Tony Rominger' AND "Stage" = '18';