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 (year INTEGER, west VARCHAR, berlin VARCHAR)
### Question:
What is the earliest year borussia dortmund was west and bfc viktoria 1889 was Berlin?
### Answer:
SELECT MIN(year) FROM table_name_90 WHERE west = "borussia dortmund" AND berlin = "bfc viktoria 1889"