user: Question: Who was the stage winner when the start of stage is Cauterets?
Columns: ['Year', 'Stage', 'Start of stage', 'Distance (km)', 'Category of climb', 'Stage winner', 'Yellow jersey']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1989.0, 10.0, 'Cauterets', '136', '1', 'Robert Millar', 'Laurent Fignon']
SQL:

assistant: SELECT "Stage winner" FROM "Table" WHERE "Start of stage" = 'Cauterets';