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 ":".
A
memorial
plaque
for
persons
who
have
died
due
to
vCJD
was
installed
in
central
London
.
A:O
memorial:O
plaque:O
for:O
persons:O
who:O
have:O
died:O
due:O
to:O
vCJD:O
was:O
installed:O
in:O
central:O
London:location-GPE
.:O