CREATE TABLE table_name_85 (host_city VARCHAR2, president_in_office VARCHAR2, year VARCHAR2)

In which host city was Margaret Thatcher the President-in-Office in 1981?
SELECT host_city FROM table_name_85 WHERE president_in_office = "margaret thatcher" AND year = 1981
SELECT "host_city" FROM "table_name_85" WHERE "margaret thatcher" = "president_in_office" AND "year" = 1981