premise: The following are lists of the most populous fully defined incorporated settlements in Nigeria by population. This page consists three different tables, with different kinds of settlements; a list for "defined cities", listing the population, strictly within the defined city limits, a list for "urban area" population, and another list for the population within metropolitan areas.
hypothesis: The lists are about settlements in all of Africa.
reason: I said the lists are about ALL of Africa which is incorrect, the context states the lists are about Nigeria.