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_22415 ( "Frequency" text, "Call sign" text, "Branding" text, "Format" text, "Owner" text, "Language/Rebroadcast" text )

### Question ###
When hot adult contemporary is the format what is the call sign?

### Accurate SQL ###

SELECT "Call sign" FROM table_22415 WHERE "Format" = 'hot adult contemporary'