instruction:
Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
question:
the archbishop of canterbury is the spiritual leader of the church of england and in the anglican communion the leader of its mother church.
answer:
archbishop of canterbury


question:
the palaeoptera is the group of primitive (basal) winged insects which do not fold the wings back over the abdomen, as neoptera do.
answer:
palaeoptera


question:
the north london line is a railway line of the london overground.
answer:

north london line