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_48625 ( "Team" text, "Head coach" text, "Team captain" text, "Kitmaker" text, "Shirt sponsor" text )

### Question ###
Who is the head coach of the team, whose shirt sponsor is karstadt quelle versicherungen?

### Accurate SQL ###

SELECT "Head coach" FROM table_48625 WHERE "Shirt sponsor" = 'karstadt quelle versicherungen'