What is the class of the a1 bm type?
CREATE TABLE table_64259 (
    "Class" text,
    "Railway number(s)" text,
    "Quantity" text,
    "Year(s) of manufacture" text,
    "Type" text
)
SELECT "Class" FROM table_64259 WHERE "Type" = 'a1 bm'
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 is the class of the a1 bm type? ### Input: CREATE TABLE table_64259 (
    "Class" text,
    "Railway number(s)" text,
    "Quantity" text,
    "Year(s) of manufacture" text,
    "Type" text
) ### Response: SELECT "Class" FROM table_64259 WHERE "Type" = 'a1 bm'