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.

The fastest lap at the Mexican Grand Prix was nigel mansell.
Mexican Grand Prix

The book titled 1634: The Ram Rebellion is a hardcover.
1634: The Ram Rebellion

One the ethnic groups on Sumatra is the Acehnese people.

Sumatra