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_51 (call_sign VARCHAR, city_of_license VARCHAR)
### Question:
What is Call Sign, when City of License is Brownfield, Texas?
### Answer:
SELECT call_sign FROM table_name_51 WHERE city_of_license = "brownfield, texas"