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_23314951_4 (opponent VARCHAR, date VARCHAR)
### Question:
If the date is 7-21-2006, who was the opponent?
### Answer:
SELECT opponent FROM table_23314951_4 WHERE date = "7-21-2006"