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.

Input: Consider Input: alphonse laveran (charles louis alphonse laveran, 18 june 1845 – 18 may 1922) was a french military doctor.

Output: alphonse laveran


Input: Consider Input: david evan mcmullin (born on april 2, 1976) is a former cia operations officer and independent presidential candidate.

Output: evan mcmullin


Input: Consider Input: an open world, sometimes called a sandbox world, is a video game design point.


Output: open world