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: John ordered Bill to leave, so an hour later he left.
 Question: Why does the 'he' refer to bill?
Example Output: Because John cannot order himself to leave.

Example Input: Sentence: They broadcast an announcement, but a subway came into the  station and I couldn't hear over it .
 Question: Why does the 'it' refer to the subway?
Example Output: Because it is hard to hear over a noise generator.

Example Input: Sentence: Kirilov ceded the presidency to Shatov because he was less popular.
 Question: Why does the 'he' refer to kirilov?
Example Output:
Because Kirilov gave up presidency. Why? Because he was less popular.