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 gates of the forest is a book written by nobel peace prize-winning author elie wiesel.
[EX A]: the gates of the forest

[EX Q]: all we know is falling is the first album of the band paramore.
[EX A]: all we know is falling

[EX Q]: walter pidgeon (september 23, 1897 – september 25, 1984) was a canadian actor.
[EX A]:
walter pidgeon