What's the classification of the institution nicknamed Dolphins?
CREATE TABLE table_587 (
    "Institution" text,
    "Location" text,
    "Nickname" text,
    "Current Conference" text,
    "Classification" text
)
SELECT "Classification" FROM table_587 WHERE "Nickname" = 'Dolphins'
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's the classification of the institution nicknamed Dolphins? ### Input: CREATE TABLE table_587 (
    "Institution" text,
    "Location" text,
    "Nickname" text,
    "Current Conference" text,
    "Classification" text
) ### Response: SELECT "Classification" FROM table_587 WHERE "Nickname" = 'Dolphins'