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_2417445_4 (reason_for_vacancy VARCHAR, district VARCHAR)

### Question ###
When massachusetts 6th is the district what is the reason for vacancy?

### Accurate SQL ###

SELECT reason_for_vacancy FROM table_2417445_4 WHERE district = "Massachusetts 6th"