user: Question: In which host city was Margaret Thatcher the President-in-Office in 1981?
Columns: ['Year', 'Date', 'Type', 'EU Council presidency', 'President-in-Office', 'Host city']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1975.0, '10–11 March', '―', 'Ireland', 'Liam Cosgrave', 'Dublin']
SQL:

assistant: SELECT "Host city" FROM "Table" WHERE "President-in-Office" = 'Margaret Thatcher' AND "Year" = 1981.0;