What is the IcAO of Frankfurt?
CREATE TABLE table_79538 (
    "City" text,
    "Country" text,
    "IATA" text,
    "ICAO" text,
    "Airport" text
)
SELECT "ICAO" FROM table_79538 WHERE "City" = 'frankfurt'
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 IcAO of Frankfurt? ### Input: CREATE TABLE table_79538 (
    "City" text,
    "Country" text,
    "IATA" text,
    "ICAO" text,
    "Airport" text
) ### Response: SELECT "ICAO" FROM table_79538 WHERE "City" = 'frankfurt'