Big Ben is a clock on which country parliament:

🧠 Explanation:

Big Ben refers to the famous clock tower located at the north end of the Palace of Westminster in the United Kingdom. It is part of the British Parliament in London and is one of the most recognized symbols of the country. The name “Big Ben” originally referred to the Great Bell inside the tower but is now commonly used for both the clock and the tower itself. The tower’s official name is the Elizabeth Tower, renamed in 2012 to honor Queen Elizabeth II. In grammar, “United Kingdom” is a proper noun identifying the country. Alternatives could be “UK” or “Britain.”