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]: the features of a production vehicle or production car are mass-produced identical models, offered for sale to the public.
[A]: production vehicle


[Q]: meaning is a term in linguistics and philosophy.
[A]: meaning


[Q]: john trumbull (; june 6, 1756november 10, 1843) was an american artist during the american revolutionary war.
[A]:
john trumbull