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_90 (stage VARCHAR, route VARCHAR)
### Question:
Which stage took the tour through Boulogne-Billancourt?
### Answer:
SELECT stage FROM table_name_90 WHERE route = "boulogne-billancourt"