What is the average number of borough councilors from Brompton?
CREATE TABLE table_38503 (
    "Borough" text,
    "Components" text,
    "Population" real,
    "Number of Borough Councilors" real,
    "Number of Municipal Councilors" real
)
SELECT AVG("Number of Borough Councilors") FROM table_38503 WHERE "Borough" = 'brompton'
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 average number of borough councilors from Brompton? ### Input: CREATE TABLE table_38503 (
    "Borough" text,
    "Components" text,
    "Population" real,
    "Number of Borough Councilors" real,
    "Number of Municipal Councilors" real
) ### Response: SELECT AVG("Number of Borough Councilors") FROM table_38503 WHERE "Borough" = 'brompton'