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_46 (week INTEGER, opponent VARCHAR)
### Question:
Which Week has an Opponent of san francisco 49ers?
### Answer:
SELECT MAX(week) FROM table_name_46 WHERE opponent = "san francisco 49ers"