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_93 ( number_of_seats INTEGER, current_status VARCHAR, year_placed_in_service VARCHAR )

### Question ###
What is the smallest number of seats in a retired vehicle that was started in service in 1981?

### Accurate SQL ###

SELECT MIN(number_of_seats) FROM table_name_93 WHERE current_status = "retired" AND year_placed_in_service = "1981"