What's the source of wealth of the person worth $17 billion?
CREATE TABLE table_79744 (
    "Name" text,
    "Birth year and age" text,
    "Net worth US$ (billions)" real,
    "Citizenship" text,
    "Source" text
)
SELECT "Source" FROM table_79744 WHERE "Net worth US$ (billions)" = '17'
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's the source of wealth of the person worth $17 billion? ### Input: CREATE TABLE table_79744 (
    "Name" text,
    "Birth year and age" text,
    "Net worth US$ (billions)" real,
    "Citizenship" text,
    "Source" text
) ### Response: SELECT "Source" FROM table_79744 WHERE "Net worth US$ (billions)" = '17'