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_18 (gold INTEGER, rank VARCHAR, nation VARCHAR)
### Question:
what is the highest gold when the rank is 12 for the nation vietnam?
### Answer:
SELECT MAX(gold) FROM table_name_18 WHERE rank = "12" AND nation = "vietnam"