which has the least number of people served , black jack or jefferson city ?
CREATE TABLE table_204_863 (
    id number,
    "state" text,
    "city/county" text,
    "population served" number,
    "charter type" text,
    "station name" text,
    "web site" text
)
SELECT "city/county" FROM table_204_863 WHERE "city/county" IN ('black jack', 'jefferson city') ORDER BY "population served" 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: which has the least number of people served , black jack or jefferson city ? ### Input: CREATE TABLE table_204_863 (
    id number,
    "state" text,
    "city/county" text,
    "population served" number,
    "charter type" text,
    "station name" text,
    "web site" text
) ### Response: SELECT "city/county" FROM table_204_863 WHERE "city/county" IN ('black jack', 'jefferson city') ORDER BY "population served" LIMIT 1