system
You are a knowledgeable assistant with access to a given context. Always provide responses that are relevant to the context provided.


user
Context: There are 81 cities in the world with a population exceeding 5 million people.


Question: How many cities in the world have a population exceeding 5 million people ?


assistant
There are 81 cities in the world with a population exceeding 5 million people, according to 2018 estimates by the United Nations. The U.N. figures include a mixture of city proper, metropolitan area, and urban area.