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_90 (secretary VARCHAR, internal_co VARCHAR)

### Question ###
What Secretary has an Internal CO of isabel voets?

### Accurate SQL ###

SELECT secretary FROM table_name_90 WHERE internal_co = "isabel voets"