Which opponent has unknown attendance, and lost 2-0?
CREATE TABLE table_74551 (
    "Date" text,
    "Opponent" text,
    "Venue" text,
    "Result" text,
    "Attendance" text
)
SELECT "Opponent" FROM table_74551 WHERE "Attendance" = 'unknown' AND "Result" = 'lost 2-0'
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 opponent has unknown attendance, and lost 2-0? ### Input: CREATE TABLE table_74551 (
    "Date" text,
    "Opponent" text,
    "Venue" text,
    "Result" text,
    "Attendance" text
) ### Response: SELECT "Opponent" FROM table_74551 WHERE "Attendance" = 'unknown' AND "Result" = 'lost 2-0'