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_33 (category VARCHAR, date VARCHAR, rider_2 VARCHAR)
### Question:
Which category earlier than 2006 has Bart Brentjens as rider 2?
### Answer:
SELECT category FROM table_name_33 WHERE date < 2006 AND rider_2 = "bart brentjens"