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_17 (d_42 VARCHAR, d_50 VARCHAR)
### Question:
What is the D 42 when the D 50 is d 31?
### Answer:
SELECT d_42 FROM table_name_17 WHERE d_50 = "d 31"