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 is the leader of the senate 2018?
answer:
Who was the majority leader of the senate in 2018?


question:
What is the largest populated city in the us?
answer:
What is the largest populated city in the US based on a 2018 estimate?


question:
Who makes the engine for the smart car?
answer:

Who makes the engine for the normally aspirated and turbo versions of the smart car?