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_31 (constructor VARCHAR, laps VARCHAR, grid VARCHAR)
### Question:
Who was the constructor of the car that went 56 laps and had a grid of 15?
### Answer:
SELECT constructor FROM table_name_31 WHERE laps = "56" AND grid = "15"