Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_50 (tyre VARCHAR, pole_position VARCHAR, race VARCHAR)
### Question:
In the Canadian Grand Prix, what tyre was used when Jacky Ickx held pole position?
### Answer:
SELECT tyre FROM table_name_50 WHERE pole_position = "jacky ickx" AND race = "canadian grand prix"