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 (icao VARCHAR, airport VARCHAR)
### Question:
What is ICAO, when Airport is "Sibulan Airport"?
### Answer:
SELECT icao FROM table_name_90 WHERE airport = "sibulan airport"