Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2709_4 (format VARCHAR, frequency VARCHAR)

### Question ###
What is the format of 105.5 fm?

### Accurate SQL ###

SELECT format FROM table_2709_4 WHERE frequency = "105.5 FM"