human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: School District, Headquarters, Sector, Enrollment (2011-12), Teachers (2008-09, Student-Teacher ratio (2008-09), French enrollment (2011-12), Graduation rate (2011-12), Withdrawal rate (2010-11)
###Question: What is their withdrawal rate for the school district with headquarters located in Truro?
gpt
SELECT Withdrawal rate (2010-11) FROM table WHERE Headquarters = Truro