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.

[EX Q]: the somatic nervous system (sns) is part of the peripheral nervous system.
[EX A]: somatic nervous system

[EX Q]: doriva (born 28 may 1972) is a former brazilian football player.
[EX A]: doriva

[EX Q]: manor house tube station is a station on the piccadilly line of the london underground, on the boundary between travelcard zone 2 and zone 3.
[EX A]:
manor house tube station