The conversation between human and AI assistant.
[|Human|] Rank the following countries in terms of population size from largest to smallest.
[|AI|] According to data from the United Nations, in 2021 the ranking of the countries in terms of population size from largest to smallest is as follows: 

1. India 
2. USA
3. Japan
[|Human|] 
Rank the following countries in terms of population size from largest to smallest.