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_38678 ( "Make" text, "Year placed in service" text, "Quantity" real, "Number of seats" real, "Wheelchair accessible? ()" text, "Current status" text )

### 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_38678 WHERE "Current status" = 'retired' AND "Year placed in service" = '1981'