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: county monaghan (in gaelic ) is a county in ireland.
Example Output: county monaghan

Example Input: the somatic nervous system (sns) is part of the peripheral nervous system.
Example Output: somatic nervous system

Example Input: jared staal (born august 21, 1990 in thunder bay, ontario) is a canadian professional ice hockey player currently with the charlotte checkers of the american hockey league.
Example Output:
jared staal