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_11 (engine_code VARCHAR, model VARCHAR)
### Question:
What is the engine code of the xdrive23d model?
### Answer:
SELECT engine_code FROM table_name_11 WHERE model = "xdrive23d"