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_79768 ( "Call sign" text, "Frequency MHz" real, "City of license" text, "ERP W" text, "Class" text, "FCC info" text )

### Question ###
Name the call sign with frequency of 89.5

### Accurate SQL ###

SELECT "Call sign" FROM table_79768 WHERE "Frequency MHz" = '89.5'