What are the titles of segment c when segment d is motorcycle brake locks?
CREATE TABLE table_15187735_21 (
    segment_c VARCHAR,
    segment_d VARCHAR
)
SELECT segment_c FROM table_15187735_21 WHERE segment_d = "Motorcycle Brake Locks"
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 are the titles of segment c when segment d is motorcycle brake locks? ### Input: CREATE TABLE table_15187735_21 (
    segment_c VARCHAR,
    segment_d VARCHAR
) ### Response: SELECT segment_c FROM table_15187735_21 WHERE segment_d = "Motorcycle Brake Locks"