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_21 (class VARCHAR, frequency_mhz VARCHAR, call_sign VARCHAR)
### Question:
Which Class has a Frequency MHz larger than 91.7, and a Call sign of k272ec?
### Answer:
SELECT class FROM table_name_21 WHERE frequency_mhz > 91.7 AND call_sign = "k272ec"