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]: odd future is a group of hip hop musicians from los angeles, united states.
[A]: odd future


[Q]: the alkaline earth metals are the second group of metals on the periodic table.
[A]: alkaline earth metal


[Q]: a spinneret is the part of a spider's body that makes its silk.
[A]:
spinneret