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_name_25 (main_use VARCHAR, town VARCHAR)
### Question:
What is the main use for the structure listed in walker city, iowa?
### Answer:
SELECT main_use FROM table_name_25 WHERE town = "walker city, iowa"