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 demographics of pakistan are a study of the population and the people.
Example Output: demographics of pakistan

Example Input: gauchin-verloingt is a commune.
Example Output: gauchin-verloingt

Example Input: the black-throated loon ("gavia arctica"), is a medium-sized member of the loon or diver family, the gaviidae.
Example Output:
black-throated loon