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: alphonse laveran (charles louis alphonse laveran, 18 june 1845 18 may 1922) was a french military doctor.
Example Output: alphonse laveran

Example Input: international day against homophobia is a day for campaigning against homophobia, transphobia and biphobia held every may 17.
Example Output: international day against homophobia

Example Input: the african golden cat ("profelis aurata") is a medium-sized cat.
Example Output:
african golden cat