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]: goldenrods are any of the about 150 species of weedy herbs that make up the genus solidago.
[EX A]: goldenrod

[EX Q]: sandpaper is a piece of paper with an abrasive glued to it.
[EX A]: sandpaper

[EX Q]: percy bysshe shelley (4 august 1792 – 8 july 1822) was an english poet of the early nineteenth century.
[EX A]:
percy bysshe shelley