When roxanne and daniel are the couple what is the highest rank?
CREATE TABLE table_19744915_18 (
    rank INTEGER,
    couple VARCHAR
)
SELECT MAX(rank) FROM table_19744915_18 WHERE couple = "Roxanne and Daniel"
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: When roxanne and daniel are the couple what is the highest rank? ### Input: CREATE TABLE table_19744915_18 (
    rank INTEGER,
    couple VARCHAR
) ### Response: SELECT MAX(rank) FROM table_19744915_18 WHERE couple = "Roxanne and Daniel"