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_823 ( "Aircraft type" text, "National Origin" text, "1st Flight" real, "In Service" text, "Retired" text, "# built" text )

### Question ###
how many Curtiss XBTC aircraft are retired?

### Accurate SQL ###

SELECT COUNT("Retired") FROM table_823 WHERE "Aircraft type" = 'Curtiss XBTC'