What circuit did Juan Manuel Fangio have the fastest lap at the german grand prix?
CREATE TABLE table_name_16 (
    circuit VARCHAR,
    fastest_lap VARCHAR,
    race VARCHAR
)
SELECT circuit FROM table_name_16 WHERE fastest_lap = "juan manuel fangio" AND race = "german grand prix"
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 circuit did Juan Manuel Fangio have the fastest lap at the german grand prix? ### Input: CREATE TABLE table_name_16 (
    circuit VARCHAR,
    fastest_lap VARCHAR,
    race VARCHAR
) ### Response: SELECT circuit FROM table_name_16 WHERE fastest_lap = "juan manuel fangio" AND race = "german grand prix"