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.

Example Input: jennifer warnes is an american singer.
Example Output: jennifer warnes

Example Input: eosinophil granulocytes, usually called "eosinophils" or "eosinophiles", are granulocyte white blood cells that fight off certain parasites and infections in vertebrates.
Example Output: eosinophil granulocyte

Example Input: the fuji fa 200 is a civilian light aircraft.
Example Output:
fuji fa 200