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_name_31 ( rider VARCHAR, rounds VARCHAR, motorcycle VARCHAR )

### Question ###
Who is riding the Ducati 999 RS in Round 7?

### Accurate SQL ###

SELECT rider FROM table_name_31 WHERE rounds = "7" AND motorcycle = "ducati 999 rs"