TASK DEFINITION: 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.
PROBLEM: When did the voting age change from 21 to 18?

SOLUTION: When did the debate begin to lower the voting age from 21 to 18?

PROBLEM: Where is the major league baseball draft held?

SOLUTION: Where is the 2017 major league baseball draft held?

PROBLEM: Where does rome's drinking water come from?

SOLUTION:
What kind of fountain does modern rome's drinking water mostly come from?