instruction:
In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.
question:
Where did the bristol stool chart come from?
answer:
Which institution did the bristol stool chart come from?


question:
When did the state of the union address start?
answer:
When did the annual state of the union address start?


question:
When is the last time the redskins won a superbowl?
answer:

What season is the last time the redskins won a superbowl?