In which host city was Margaret Thatcher the President-in-Office in 1981?
CREATE TABLE table_51628 (
    "Year" real,
    "Date" text,
    "Type" text,
    "EU Council presidency" text,
    "President-in-Office" text,
    "Host city" text
)
SELECT "Host city" FROM table_51628 WHERE "President-in-Office" = 'margaret thatcher' AND "Year" = '1981'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: In which host city was Margaret Thatcher the President-in-Office in 1981? ### Input: CREATE TABLE table_51628 (
    "Year" real,
    "Date" text,
    "Type" text,
    "EU Council presidency" text,
    "President-in-Office" text,
    "Host city" text
) ### Response: SELECT "Host city" FROM table_51628 WHERE "President-in-Office" = 'margaret thatcher' AND "Year" = '1981'