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_90 (power VARCHAR, class VARCHAR, identifier VARCHAR)
### Question:
What is the power that belongs to Class A with an Identifier of CBOC-FM?
### Answer:
SELECT power FROM table_name_90 WHERE class = "a" AND identifier = "cboc-fm"