user: Question: Which Stage has a Mountains classification of Filippo Savini?
Columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Asian rider classification', 'Team classification', 'Asian team classification']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Matthieu Sprick', 'Matthieu Sprick', 'Mitchell Docker', 'not available', 'Shinichi Fukushima', 'Diquigiovanni-Androni', 'Seoul Cycling Team']
SQL:

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