You need to read the given sentence and construct a question about the information present in the sentence. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is unique. The question must involve coreference resolution which is a 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: Jane knocked on Susan's door but she did not answer.

Output: Who did not answer?


Input: Consider Input: Sentence: Tom gave Ralph a lift to school so he wouldn't have to drive alone.

Output: Who wouldn't have to drive alone?


Input: Consider Input: Sentence: James asked Robert for a favor but he refused.


Output: Who refused?