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_98 (surface VARCHAR, date VARCHAR)
### Question:
The game played 31 May 2010 was played on what surface?
### Answer:
SELECT surface FROM table_name_98 WHERE date = "31 may 2010"