In this task, you're given a sentence and question. Based on the information provided in a given sentence, you should identify the shortest continuous text span from the sentence that serves as an answer to the given question. Answer the question using coreference resolution. Coreference resolution is the task of clustering mentions in text that refer to the same underlying real world entities. For example let's take a sentence 'I voted for Obama because he was most aligned with my values, she said.' Here in this example 'I', 'my', and 'she' belong to the same cluster and 'Obama' and 'he' belong to the same cluster. Now let's discuss another example , original sentence: 'I voted for Trump because he was most aligned with my values',John said. Now here is the same sentence with resolved coreferences: 'John voted for Trump because Trump was most aligned with John's values',John said. 

Input: Consider Input: Sentence: Dan had to stop Bill from toying with the injured bird. He is very compassionate. Question: Who is compassionate?

Output: Dan


Input: Consider Input: Sentence: Joe paid the detective after he received the final report on the case. Question: Who received the final report?

Output: Joe


Input: Consider Input: Sentence: The police arrested all of the criminals. They were trying to run the drug trade in the neighborhood. Question: Who was trying to run the drug trade?


Output: criminals