When was the incumbent in the Tennessee 4 district first elected?
CREATE TABLE table_18164 (
    "District" text,
    "Incumbent" text,
    "Party" text,
    "First elected" real,
    "Results" text,
    "Candidates" text
)
SELECT "First elected" FROM table_18164 WHERE "District" = 'Tennessee 4'
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: When was the incumbent in the Tennessee 4 district first elected? ### Input: CREATE TABLE table_18164 (
    "District" text,
    "Incumbent" text,
    "Party" text,
    "First elected" real,
    "Results" text,
    "Candidates" text
) ### Response: SELECT "First elected" FROM table_18164 WHERE "District" = 'Tennessee 4'