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_79 (station VARCHAR, country_of_origin VARCHAR, frequency VARCHAR)
### Question:
Which station is from China and has a frequency of 684khz?
### Answer:
SELECT station FROM table_name_79 WHERE country_of_origin = "china" AND frequency = "684khz"