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_2709_4 (format VARCHAR, frequency VARCHAR)
### Question:
What is the format of 105.5 fm?
### Answer:
SELECT format FROM table_2709_4 WHERE frequency = "105.5 FM"