user: Question: What was the pole position at the San Marino Grand Prix with Michael Schumacher as winning driver?
Columns: ['Grand Prix', 'Pole Position', 'Fastest Lap', 'Winning Driver', 'Constructor', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Australian Grand Prix', 'Michael Schumacher', 'Michael Schumacher', 'Michael Schumacher', 'Ferrari', 'Report']
SQL:

assistant: SELECT "Pole Position" FROM "Table" WHERE "Winning Driver" = 'Michael Schumacher' AND "Grand Prix" = 'San Marino Grand Prix';