With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Selenium
sulfide
is
also
used
to
treat
tinea
versicolor
,
a
fungal
infection
of
the
skin
.
Selenium:other-chemicalthing
sulfide:other-chemicalthing
is:O
also:O
used:O
to:O
treat:O
tinea:O
versicolor:O
,:O
a:O
fungal:O
infection:O
of:O
the:O
skin:O
.:O