In the list of tokens, identify 'Person', 'Location', and 'Organisation' and label each accordingly. If the entity spans multiple tokens, use the prefix B-PER, B-LOC, or B-ORG for the first token, and I-PER, I-LOC, or I-ORG for the subsequent tokens of that entity. The beginning of each separate entity should always be labeled with a B-PER, B-LOC, or B-ORG prefix. If the token does not fit into any of the three named categories, or is not a named entity, label it as 'O'. Each line should contain one token and its corresponding label, separated by a colon. Do not combine tokens on your own. The format for each line should be: 'token:label'.

Text: Iran
's
agreement
with
major
world
powers
to
curtail
its
nuclear
program
in
exchange
for
the
lifting
of
economic
sanctions
opens
up
the
world
's
fourth
-
largest
oil
reserves
,
second
-
largest
natural
gas
reserves
and
an
80
million
population
to
multinationals
.
Answer: 
Iran:B-LOC
's:O
agreement:O
with:O
major:O
world:O
powers:O
to:O
curtail:O
its:O
nuclear:O
program:O
in:O
exchange:O
for:O
the:O
lifting:O
of:O
economic:O
sanctions:O
opens:O
up:O
the:O
world:O
's:O
fourth:O
-:O
largest:O
oil:O
reserves:O
,:O
second:O
-:O
largest:O
natural:O
gas:O
reserves:O
and:O
an:O
80:O
million:O
population:O
to:O
multinationals:O
.:O