In a parliamentary system, the head of government is usually…

In a parliamentary system, the head of government is usually the

  1. President
  2. King or Queen
  3. Prime minister ✓
  4. Chief Justice

Explanation

The Prime Minister leads the government in parliamentary systems. This person runs the day-to-day operations.

A president or king/queen may be head of state (ceremonial role). The Chief Justice leads the courts.

The Prime Minister has real power to make policies and must answer to parliament.