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: the bumblebee bat ("craseonycteris thonglongyai"), also known as kitti's hog-nosed bat, is an endangered species of bat.
Example Output: bumblebee bat

Example Input: a web hosting service is a type of internet hosting service.
Example Output: web hosting service

Example Input: the pseudomonadales are an order of proteobacteria.
Example Output:
pseudomonadales