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_16741821_8 (surface VARCHAR, opponent VARCHAR)
### Question:
WHAT WAS THE SURFACE MADE OF WHEN THE OPPONENT WAS GEORGE KHRIKADZE?
### Answer:
SELECT surface FROM table_16741821_8 WHERE opponent = "George Khrikadze"