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_27631756_2 ( captain VARCHAR, shirt_sponsor VARCHAR )

### Question ###
What is the name of the captain when teh shirt sponsor is n/a?

### Accurate SQL ###

SELECT captain FROM table_27631756_2 WHERE shirt_sponsor = "N/A"