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.
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Question: plumbaginaceae is a family of flowering plants are about 560 species in 10 genera found all over the world.

Answer: plumbaginaceae

Question: rita gam (april 2, 1927march 22, 2016) was an american and television actress and documentary filmmaker.

Answer: rita gam

Question: dark rainbow is an indian bollywood movie, directed by abhik bhanu.

Answer:
dark rainbow