user: Question: When 4 is the stage who is the general classification?
Columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Asian rider classification', 'Team classification', 'Asian team classification']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Mattia Gavazzi', 'Mattia Gavazzi', 'Mattia Gavazzi', 'Jaco Venter', 'Dmitriy Gruzdev', 'South Africa', 'Malaysia']
SQL:

assistant: SELECT "General classification" FROM "Table" WHERE "Stage" = 4.0;