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_75 (message VARCHAR, designation_hd VARCHAR)
### Question:
What message has hd 186408 as a designation HD?
### Answer:
SELECT message FROM table_name_75 WHERE designation_hd = "hd 186408"