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: 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: barbara boxer (born november 11, 1940) is an american politician.
Example Output: barbara boxer

Example Input: dennis kearney (18471907) was an american politician who was himself an immigrant from ireland.
Example Output:
dennis kearney