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 (class VARCHAR, vehicle VARCHAR, year VARCHAR)
### Question:
Which class had a vehicle of Nissan in 2007?
### Answer:
SELECT class FROM table_name_31 WHERE vehicle = "nissan" AND year = 2007