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 embassy of russia in copenhagen is the embassy of russia to denmark.

A: embassy of russia in copenhagen
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Q: karl mannheim (27 march 1893 - 9 january 1947), or károly mannheim in original writing of his name, was a hungarian-german sociologist and social scientist.

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

A:
production vehicle
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