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_23575917_6 (first_broadcast VARCHAR, davids_team VARCHAR)
### Question:
When david o'doherty and katherine parkinson are both on the davids team when is the first broadcast?
### Answer:
SELECT first_broadcast FROM table_23575917_6 WHERE davids_team = "David O'Doherty and Katherine Parkinson"