Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_15187735_21 (segment_b VARCHAR, segment_c VARCHAR)
### Question:
What are the titles of segment b when segment c is standby generators (part 1)?
### Answer:
SELECT segment_b FROM table_15187735_21 WHERE segment_c = "Standby Generators (Part 1)"