You are given a sentence and a question, construct 2 answer options in a specific format i.e. ['option1','option2']. The answer options have to be text spans from the given sentence. Only one among the options should be the correct answer to the given question. Note that, the correct answer to the given question will require understanding of coreference resolution. Coreference resolution is the task of clustering mentions in text that refer to the same underlying real world entities.

Sentence: Sam Goodman's biography of the Spartan general Xenophanes conveys a vivid sense of the difficulties he faced in his research. Question: Who faced difficulties?
['Xenophanes', 'Sam']

Sentence: As Andrea in the crop duster passed over Susan, she could see the landing strip. Question: Who could see the landing strip?
['Andrea', 'Susan']

Sentence: Bill passed the half-empty plate to John because he was full. Question: Who was full?

Bill, John