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_83 (type VARCHAR, course VARCHAR, date VARCHAR)
### Question:
What type has rest day as a course and was on 21 may?
### Answer:
SELECT type FROM table_name_83 WHERE course = "rest day" AND date = "21 may"