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_99 (opponent VARCHAR, week VARCHAR, date VARCHAR)
### Question:
Who was the opponent before week 5 that played on September 23, 2001?
### Answer:
SELECT opponent FROM table_name_99 WHERE week < 5 AND date = "september 23, 2001"