What is the lowest points of using mclaren m14a as chassis?
CREATE TABLE table_68639 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
)
SELECT MIN("Points") FROM table_68639 WHERE "Chassis" = 'mclaren m14a'
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 lowest points of using mclaren m14a as chassis? ### Input: CREATE TABLE table_68639 (
    "Year" real,
    "Entrant" text,
    "Chassis" text,
    "Engine" text,
    "Points" real
) ### Response: SELECT MIN("Points") FROM table_68639 WHERE "Chassis" = 'mclaren m14a'