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_23 (call_sign VARCHAR, virtual_channel VARCHAR)
### Question:
Virtual channel of 16.5 has what call sign?
### Answer:
SELECT call_sign FROM table_name_23 WHERE virtual_channel = "16.5"