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_81 ( lijsttrekker VARCHAR, cabinet VARCHAR, fractievoorzitter VARCHAR )

### Question ###
What is Lijsttrekker, when Cabinet is 'Hans Van Mierlo', and when Fractievoorzitter is 'Thom De Graaf'?

### Accurate SQL ###

SELECT lijsttrekker FROM table_name_81 WHERE cabinet = "hans van mierlo" AND fractievoorzitter = "thom de graaf"