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_21 (rider VARCHAR, manufacturer VARCHAR, grid VARCHAR)
### Question:
Who is the rider with a yamaha manufacturer and a 17 grid?
### Answer:
SELECT rider FROM table_name_21 WHERE manufacturer = "yamaha" AND grid = "17"