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: When is the last time liverpool won the premier league?

SOLUTION: 1989-90

PROBLEM: When did the civil war end in sierra leone?

SOLUTION: 18 January 2002

PROBLEM: Is lithium a solid liquid or gas at room temp?

SOLUTION:
solid