Who constructed pedro diniz's car?
CREATE TABLE table_51703 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)
SELECT "Constructor" FROM table_51703 WHERE "Driver" = 'pedro diniz'
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 constructed pedro diniz's car? ### Input: CREATE TABLE table_51703 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
) ### Response: SELECT "Constructor" FROM table_51703 WHERE "Driver" = 'pedro diniz'