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.

Sentence: The painting in Mark's living room shows an oak tree. It is to the right of a house.
 Question: Why does the 'It' refer to the oak tree?
Because The sentence describes the painting, so you assume the oak tree is next to a house.

Sentence: Jim signaled the barman and gestured toward his bathroom key.
 Question: Why does the 'his' refer to the barman?
Because Context: Jim signaled the barman and gestured toward his bathroom key.

Sentence: I couldn't find a spoon, so I tried using a pen to stir my  coffee. But that turned out to be a bad idea, because it got full of coffee.
 Question: Why does the 'it' refer to the pen?

Because The coffee is already full, so you assume its the pen.