What titles were fought for on 1997-04-12?
CREATE TABLE table_17557 (
    "Number" real,
    "Name" text,
    "Titles" text,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Defenses" real
)
SELECT "Titles" FROM table_17557 WHERE "Date" = '1997-04-12'
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 titles were fought for on 1997-04-12? ### Input: CREATE TABLE table_17557 (
    "Number" real,
    "Name" text,
    "Titles" text,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Defenses" real
) ### Response: SELECT "Titles" FROM table_17557 WHERE "Date" = '1997-04-12'