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_26 (year__ceremony_ VARCHAR, category VARCHAR, actor_actress VARCHAR)
### Question:
What is the year when sigourney weaver was nominated for best actress?
### Answer:
SELECT year__ceremony_ FROM table_name_26 WHERE category = "best actress" AND actor_actress = "sigourney weaver"