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: panoplosaurus was an armored tank-like dinosaur from the upper cretaceous, living about 76–73 million years ago.
Example Output: panoplosaurus

Example Input: bobital (, gallo: "bobitau") is a commune.
Example Output: bobital

Example Input: the northeast region of brazil is one of the five geographical regions of brazil defined by the brazilian institute of geography and statistics in 1969.
Example Output:
northeast region of brazil