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_29728787_1 ( olivier VARCHAR, la_roche VARCHAR )

### Question ###
When karl ridderbusch is the la roche who is the olivier?

### Accurate SQL ###

SELECT olivier FROM table_29728787_1 WHERE la_roche = "Karl Ridderbusch"