In this task you need to give reasons to justify the pronoun coreference relations. Each of the provided inputs contains a sentence with a target pronoun and a question about how to justify the coreference between a noun phrase and the target pronoun. Good practices involve the discussion about how the descriptions attached to the targeted pronoun relate to the noun phrase candidate in the question. The reasoning could come from one or multiple following knowledge types about commonsense: First: 'Property', the knowledge about property of objects (e.g., ice is cold). Second: 'Object', the knowledge about objects (e.g., cats have ears). Third: 'Eventuality', the knowledge about eventuality (e.g., 'wake up' happens before 'open eyes'). Forth: 'Spatial', the knowledge about spatial position (e.g., object at the back can be blocked). Fifth: 'Quantity', the knowledge about numbers (e.g., 2 is smaller than 10). Sixth: all other knowledge if above ones are not suitable. Write the sentence in natural language.

Example Input: Sentence: Bob paid for Charlie's college education. He is very generous.
 Question: Why does the 'He' refer to bob?
Example Output: Because He is very generous. Bob paid for Charlie's college education.

Example Input: Sentence: Frank felt crushed when his longtime rival Bill revealed that he was the winner of the competition.
 Question: Why does the 'he' refer to bill?
Example Output: Because Frank was upset. So you assume Bill, his rival, won.

Example Input: Sentence: The father carried the sleeping boy in his arms
 Question: Why does the 'his' refer to the father?
Example Output:
Because He carried the boy.