user: Question: What is the mountains classification when stage is 17?
Columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Intergiro classification', 'Trofeo Fast Team', 'Trofeo Super Team']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['P', 'Brett Lancaster', 'Brett Lancaster', 'not awarded', 'not awarded', 'not awarded', 'Fassa Bortolo', 'not awarded']
SQL:

assistant: SELECT "Mountains classification" FROM "Table" WHERE "Stage" = '17';