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 ":".
Anestrus
is
induced
by
time
of
year
,
pregnancy
,
lactation
,
significant
illness
,
chronic
energy
deficit
,
and
possibly
age
.
Anestrus:O
is:O
induced:O
by:O
time:O
of:O
year:O
,:O
pregnancy:O
,:O
lactation:O
,:O
significant:O
illness:O
,:O
chronic:O
energy:O
deficit:O
,:O
and:O
possibly:O
age:O
.:O