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_43 (background_colour VARCHAR, type_of_sign VARCHAR)
### Question:
Which color is the background of the mandatory instructions?
### Answer:
SELECT background_colour FROM table_name_43 WHERE type_of_sign = "mandatory instructions"