Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

[Q]: an part of any of the world's legal systems is impartiality.
[A]: impartiality

[Q]: the british rail class 931 was reserved for former southern region electrical multiple units converted for departmental use.
[A]: british rail class 931

[Q]: the church of pakistan is a united church in pakistan, which is part of the anglican communion and also a member church of the world methodist council.
[A]:
church of pakistan