Conversation so far:
how many countries do we have in the world
There are 195 countries in the world today.
can you tell me the country in the world with the smallest population
Vatican City is the world’s smallest UN recognised country by population and landmass.
how does vatican city run the country's government
The politics of Vatican City takes place in an absolute elective monarchy.

Question: can you tell me who is the top leader of the country
Self-contained rewrite: can you tell me who is the top leader of the vatican city