TASK DEFINITION: An answer is given. Generate a question for which the given answer is either a direct or partial answer.
PROBLEM: Answer: khartoum

SOLUTION: four largest cities on the nile river?

PROBLEM: Answer: bristol

SOLUTION: what is the biggest city in the west of england?

PROBLEM: Answer: james s. sherman

SOLUTION:
who was the us vice president of 1910 to 1919?