With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
These
students
apparently
brought
the
virus
back
from
Mexico
and
infected
their
classmates
.
These:O
students:O
apparently:O
brought:O
the:O
virus:O
back:O
from:O
Mexico:location-GPE
and:O
infected:O
their:O
classmates:O
.:O