With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
It
is
a
short-acting
β2
adrenergic
receptor
agonist
which
works
by
causing
relaxation
of
airway
smooth
muscle
.
It:O
is:O
a:O
short-acting:O
β2:O
adrenergic:O
receptor:O
agonist:O
which:O
works:O
by:O
causing:O
relaxation:O
of:O
airway:O
smooth:O
muscle:O
.:O