user: Question: IN WHAT STAGE DID Alexander Vinokourov WON THE GENERAL CLASSIFICATION?
Columns: ['Stage (Winner)', 'General classification', 'Mountains classification', 'Points classification', 'Combination classification', 'Team Classification']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['0 Prologue ( Bradley Wiggins )', 'Bradley Wiggins', 'Sylvain Chavanel', 'Bradley Wiggins', 'Bradley Wiggins', 'no award']
SQL:

assistant: SELECT "Stage (Winner)" FROM "Table" WHERE "General classification" = 'Alexander Vinokourov';