TASK DEFINITION: In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
PROBLEM: Who owns the treasure island in las vegas?

SOLUTION: Phil Ruffin

PROBLEM: When did nigeria become a federation of 19 states?

SOLUTION: 1976

PROBLEM: What do sodium and magnesium have in common?

SOLUTION:
occur in nature and have at least one stable isotope