What is the smallest city area?
CREATE TABLE table_22330 (
    "Serial No." real,
    "District" text,
    "Headquartered City" text,
    "City Population (2009)" real,
    "City Area(km 2 )" real
)
SELECT MIN("City Area(km 2 )") FROM table_22330
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: What is the smallest city area? ### Input: CREATE TABLE table_22330 (
    "Serial No." real,
    "District" text,
    "Headquartered City" text,
    "City Population (2009)" real,
    "City Area(km 2 )" real
) ### Response: SELECT MIN("City Area(km 2 )") FROM table_22330