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

SOLUTION: who was the japenese naval leader during world war 2?

PROBLEM: Answer: milk sickness

SOLUTION: lincolns mom died of what?

PROBLEM: Answer: willem-alexander of the netherlands

SOLUTION:
who is the head of state of aruba and netherlands?