Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_57537 ( "Race" text, "Circuit" text, "Date" text, "Pole position" text, "Fastest lap" text, "Winning driver" text, "Constructor" text, "Tyre" text, "Report" text )

### Question ###
In the Canadian Grand Prix, what tyre was used when Jacky Ickx held pole position?

### Accurate SQL ###

SELECT "Tyre" FROM table_57537 WHERE "Pole position" = 'jacky ickx' AND "Race" = 'canadian grand prix'