Given the task definition, example input & output, solve the new input case.
This task is about identifying the subject of a given sentence. The subject of a sentence is the person, place, or thing that is performing the action of the sentence. The subject represents what or whom the sentence is about. Each sentence in this task is guaranteed to contain a single subject. The input is a sentence and the output is the identified subject of that sentence.
Example: The nickname of the  team of University of Nebraska at Omaha is mavericks.
Output: University of Nebraska
This is a good example since the subject of the sentence (University of Nebraska) is correctly identified.

New input case for you: Georgetown is the county seat of Williamson County, Texas.
Output:
Williamson County, Texas