Which Frequency MHz has a ERP W of 250?
CREATE TABLE table_38571 (
    "Call sign" text,
    "Frequency MHz" real,
    "City of license" text,
    "ERP W" real,
    "Class" text,
    "FCC info" text
)
SELECT MAX("Frequency MHz") FROM table_38571 WHERE "ERP W" = '250'
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: Which Frequency MHz has a ERP W of 250? ### Input: CREATE TABLE table_38571 (
    "Call sign" text,
    "Frequency MHz" real,
    "City of license" text,
    "ERP W" real,
    "Class" text,
    "FCC info" text
) ### Response: SELECT MAX("Frequency MHz") FROM table_38571 WHERE "ERP W" = '250'