Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15187735_21 ( segment_c VARCHAR, segment_d VARCHAR )

### Question ###
What are the titles of segment c when segment d is motorcycle brake locks?

### Accurate SQL ###

SELECT segment_c FROM table_15187735_21 WHERE segment_d = "Motorcycle Brake Locks"