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_16 ( task_no INTEGER, head_of_household VARCHAR )

### Question ###
What is the latest task number for which Cathy is head of household?

### Accurate SQL ###

SELECT MAX(task_no) FROM table_name_16 WHERE head_of_household = "cathy"