Who is the constructor with the grid of 8?
CREATE TABLE table_55691 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)
SELECT "Constructor" FROM table_55691 WHERE "Grid" = '8'
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: Who is the constructor with the grid of 8? ### Input: CREATE TABLE table_55691 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
) ### Response: SELECT "Constructor" FROM table_55691 WHERE "Grid" = '8'