Title: Great Britain
Content: Largest urban areas London is the capital of England and the whole of the United Kingdom, and is the seat of the United Kingdom's government. Edinburgh and Cardiff are the capitals of Scotland and Wales, respectively, and house their devolved governments. 
Title: United Kingdom
Content:  total area of the United Kingdom is 93,628 sqmi, with an estimated population in 2020 of 68 million. The United Kingdom is a unitary parliamentary democracy and constitutional monarchy. The monarch, Queen Elizabeth II, has reigned since 1952. The capital and largest city is London, a global city and financial centre with a metropolitan area population of 14 million. The United Kingdom consists of four countries: England, Scotland, Wales and Northern Ireland. Other than England, the constituent countries have their own devolved governments, each with varying powers. The United Kingdom has evolved from a series of annexations, unions and separations of constituent countries over several hundred years. The Treaty of Union between the Kingdom of 
Title: List of modern great powers
Content:  population in 2020 of 68 million. The United Kingdom is a unitary parliamentary democracy and constitutional monarchy. The monarch, Queen Elizabeth II, has reigned since 1952. The capital and largest city is London, a global city and financial centre with a metropolitan area population of 14 million. The United Kingdom consists of four countries: England, Scotland, Wales and Northern Ireland. Other than England, the constituent countries have their own devolved governments, each with varying powers. The United Kingdom has evolved from a series of annexations, unions and separations of constituent countries over several hundred years. The Treaty of Union between the Kingdom of England (which included Wales, annexed in 1542) and the Kingdom of Scotland in 1707 
Title: Second city of the United Kingdom
Content:  The second city of the United Kingdom is an unofficial claim made at various times by several cities since the establishment of the Kingdom of Great Britain in 1707 (the United Kingdom was formed in January 1801). Commonly a country's |second city is the city that is thought to be the second-most important, usually after the capital or first city according to criteria such as population size, economic importance and cultural contribution. The UK, in urban geography terms, has been classified as adhering to the primate city rule, meaning that the largest city in the nation outweighs every other city by orders of magnitude. London, the UK's capital, is by far the largest city, leaving other cities to be closer in prominence having been 
Title: Outline of the United Kingdom
Content: Cities ; Capital of the United Kingdom: London ; Second city of the United Kingdom ; Cities by population ; Towns: ; Towns in England ; Burghs in Scotland ; Towns in Wales ; Towns in Northern Ireland ; City status in the United Kingdom ; Conurbations ; Green belt 
Title: List of cities in the United Kingdom
Content: Gibraltar the capital of Gibraltar. ; Hamilton the capital of Bermuda. ; City of James Town the capital of Saint Helena. There are a number of cities in the British Overseas Territories.
Title: London
Content:  London is the capital and largest city of England and the United Kingdom. It stands on the River Thames in south-east England at the head of a 50 mi estuary down to the North Sea, and has been a major settlement for two millennia. The City of London, its ancient core and financial centre, was founded by the Romans as Londinium and retains boundaries close to its medieval ones. Since the 19th century, "London" has also referred to the metropolis around this core, historically split between the counties of Middlesex, Essex, Surrey, Kent, and Hertfordshire, which largely makes up Greater London, the region governed by the Greater London Authority. The 
Title: Caput Mundi
Content:  The capital of the British Empire, the largest empire in history, London, was often called the Novum Caput Mundi. It was part of the Roman Empire and has been a major settlement since the epoch of Ancient Rome. London still remains one of the world's leading business, financial, and cultural centres, and its influence in politics, education, technology, entertainment, media, fashion and the arts all contribute to its status as a major global city. Many of the world's largest corporations have their headquarters in London, the city taking a central role as a part of the wider global economy. In addition London in time and on maps is on the Prime Meridian, running directly through Greenwich (also known as the Greenwich Meridian), with its time zone as GMT+0 (UTC+0). The decision made at 
Title: Outline of London
Content:  The following outline is provided as an overview of and topical guide to London: London – capital and most populous city of England, Great Britain, and the United Kingdom. On the River Thames in the south east of the island of Great Britain, London has been a major settlement for two millennia. It was founded by the Romans, who named it Londinium. London is a cultural capital and leading global city in the arts, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, research and development, tourism, and transport. It is the world's financial capital and has the fifth-or sixth-largest metropolitan area GDP in the world.
Title: Politics of England
Content:  Politics of England forms the major part of the wider politics of the United Kingdom, with England being more populous than all the other countries of the United Kingdom put together. As England is also by far the largest in terms of area and GDP, its relationship to the UK is somewhat different from that of Scotland, Wales or Northern Ireland. The English capital London is also the capital of the UK, and English is the dominant language of the UK (not officially, but de facto). Dicey and Morris (p26) list the separate states in the British Islands. "England, Scotland, Northern Ireland, the Isle of Man, Jersey, Guernsey, Alderney, and Sark.... is a separate country in the sense of the conflict of laws, though not one of them is a State known to public international law." But this may be varied by statute. The United Kingdom is one state 

Question: What is the capital of United Kingdom?
Answer: London.
London, UK.
London, United Kingdom.
London, England.
Modern Babylon.