Solomon Islands is a constitutional monarchy, with Queen Elizabeth II as head of state. The Queen is represented by a governor-general, who must be a citizen of the country and is elected by parliament. The National Parliament is unicameral, with 50 seats. Elections are held every four years on the basis of universal adult suffrage. The prime minister, who is chosen by parliament, must be an MP; the cabinet is chosen by the prime minister and holds executive power. Honiara has a town council for local government, and there are provincial administrations in the nine provinces.