Hey there!
Here is your answer:
The proper answer to this question is "a Prime Minister".
Reason:
A Prime minister is kind of like a president but for a different type of government which is the parliamentary democracy. This type of government takes place in most foreign country for example: Asia has a prime minister. Are government is called a democracy which is a another type of government world leaders have.
Therefore the answer is Prime Minister.
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit