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]: san diego creek is a small northwest-flowing river in orange county, california.
[EX A]: san diego creek

[EX Q]: painting is using colours to make art.
[EX A]: painting

[EX Q]: metropolitan-vickers, metrovick, or metrovicks, was a british heavy electrical engineering company of the early-to-mid 20th century formerly known as british westinghouse.
[EX A]:
metropolitan-vickers