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_13 (nation_of_citizenship VARCHAR, type_of_vehicle VARCHAR, year VARCHAR)

### Question ###
What Nation of citizenship has a stock car vehicle with a year of 2012?

### Accurate SQL ###

SELECT nation_of_citizenship FROM table_name_13 WHERE type_of_vehicle = "stock car" AND year = 2012