Name the general classification of stage 15
CREATE TABLE table_17566 (
    "Stage" text,
    "Winner" text,
    "General classification" text,
    "Points classification" text,
    "Mountains classification" text,
    "Young rider classification" text,
    "Trofeo Fast Team" text
)
SELECT COUNT("General classification") FROM table_17566 WHERE "Stage" = '15'
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: Name the general classification of stage 15 ### Input: CREATE TABLE table_17566 (
    "Stage" text,
    "Winner" text,
    "General classification" text,
    "Points classification" text,
    "Mountains classification" text,
    "Young rider classification" text,
    "Trofeo Fast Team" text
) ### Response: SELECT COUNT("General classification") FROM table_17566 WHERE "Stage" = '15'