what city is the largest by surface area ?
CREATE TABLE table_203_731 (
    id number,
    "pos." text,
    "city" text,
    "population\n(ab)" number,
    "surface\n(km2)" number,
    "density\n(ab/km2)" number,
    "altitude\n(mslm)" number
)
SELECT "city" FROM table_203_731 ORDER BY "surface\n(km2)" DESC LIMIT 1
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 city is the largest by surface area ? ### Input: CREATE TABLE table_203_731 (
    id number,
    "pos." text,
    "city" text,
    "population\n(ab)" number,
    "surface\n(km2)" number,
    "density\n(ab/km2)" number,
    "altitude\n(mslm)" number
) ### Response: SELECT "city" FROM table_203_731 ORDER BY "surface\n(km2)" DESC LIMIT 1