What is the identifier that has 50,000 watts of power?
CREATE TABLE table_41556 (
    "City of license" text,
    "Identifier" text,
    "Frequency" text,
    "Power" text,
    "Class" text,
    "RECNet" text
)
SELECT "Identifier" FROM table_41556 WHERE "Power" = '50,000 watts'
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 identifier that has 50,000 watts of power? ### Input: CREATE TABLE table_41556 (
    "City of license" text,
    "Identifier" text,
    "Frequency" text,
    "Power" text,
    "Class" text,
    "RECNet" text
) ### Response: SELECT "Identifier" FROM table_41556 WHERE "Power" = '50,000 watts'