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:
Who played marilla on anne of green gables?
answer:
Who played marilla on the 1919 film anne of green gables?


question:
When did the ussr agree to a unified germany inside of nato?
answer:
When did Gorbachev express agreement with a unified Germany inside of NATO?


question:
Who came up with the idea of mother's day?
answer:

What company came up with the idea to commercialize Mother's Day ?|What company came up with the idea to commercialize Mother's Day?|What company originally came up with the idea to commercialize Mother's Day?