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_91 (completed VARCHAR, builder VARCHAR, name VARCHAR)
### Question:
When did chatham complete the Hmsmedusa?
### Answer:
SELECT completed FROM table_name_91 WHERE builder = "chatham" AND name = "hmsmedusa"