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: parnassiinae is a subfamily of butterflies.

Answer: parnassiinae


Question: giorgio chiellini (born 14 august 1984) is an italian football player.

Answer: giorgio chiellini


Question: christina applegate (born november 25, 1971) is an american actress.

Answer:
christina applegate