Final answer:
In a parliamentary democracy, the head of government, often called the prime minister, is elected by the legislature, distinguishing it from systems where a head of state is a monarch or a dictator.
Step-by-step explanation:
In a parliamentary democracy, the true statement regarding the head of government is that the head of government is elected by the legislature. Typically, in parliamentary systems, the elected members of the legislature, which is often a parliament, select the head of government, commonly referred to as the prime minister. This individual then becomes the political head of the state and may also advise or work alongside the figurative head of state, who could be a monarch or a ceremonial president, depending on the country's specific governmental structure. An absolute monarchy or a dictatorship would not feature a legislature-elected head of government as those systems concentrate power in the hands of an individual, be it a monarch or dictator, respectively.