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_21514460_1 (withdrawal_rate__2010_11_ VARCHAR, headquarters VARCHAR)

### Question ###
What is their withdrawal rate for the school district with headquarters located in Truro?

### Accurate SQL ###

SELECT withdrawal_rate__2010_11_ FROM table_21514460_1 WHERE headquarters = "Truro"