UK political institutions : key terms and definitions

Match the following key terms related to the UK political institutions with their correct definitions:

1. The Prime Minister
2. The House of Commons
3. The House of Lords
4. The Monarchy

Definitions: A) The upper house of the UK Parliament, whose members are not elected. B) The head of the government who lives at 10 Downing Street. C) The hereditary institution representing the state, currently led by the King. D) The main legislative body where elected Members of Parliament debate laws.

Format your answer as a list, for example: 1-B, 2-D, etc.