The head of the executive branch of parliamentary system is called

The head of the executive branch of a parliamentary system is called the Prime Minister. In a parliamentary system, the head of the government is the Prime Minister, who is the leader of the political party or coalition that has the majority of seats in the parliament. The Prime Minister is appointed by the monarch or president, depending on the type of parliamentary system in place. The Prime Minister has the responsibility of selecting and leading the cabinet of ministers who are responsible for running the government and making decisions on behalf of the country. They are also responsible for the day-to-day administration of the country and act as the spokesperson for the government on national and international matters. In contrast to a presidential system, where the President is both the head of state and head of the government, in a parliamentary system, the head of state is a different person, such as a monarch or president, who has a ceremonial role and represents the country on official occasions. Therefore, the correct answer is: Prime Minister.