Sam asks why, prompting Dean to wonder what Sam did in college.

Entity and relation annotations:
id: 0
type: entity
value: text: Sam
labels: <Person>
id: 1
type: entity
value: text: Dean
labels: <Person>
id: 2
type: entity
value: text: Sam
labels: <Person>
type: relation
to_id: 2
labels: Person:coreference:Person
from_id: 0