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_19 (frequency VARCHAR, call_sign VARCHAR)
### Question:
What is the frequency of the radio station with a call sign of WGNR-FM?
### Answer:
SELECT frequency FROM table_name_19 WHERE call_sign = "wgnr-fm"