Question: Clarence House has been the official residence of the heir apparent of who?
Context: Charles, Prince of Wales (Charles Philip Arthur George; born 14 November 1948) is the eldest child and heir apparent of Queen Elizabeth II.  Known alternatively in Cornwall as Duke of Cornwall and in Scotland as Duke of Rothesay, he is the longest-serving heir apparent in British history, having held the position since 1952.  He is also the oldest person to be next in line to the throne since Sophia of Hanover (the heir presumptive to Queen Anne), who died in 1714 at the age of 83. This is a list of those people who were heir apparent or heir presumptive to the Kingdom of Prussia from its foundation in 1701 to the end of the monarchy in 1918.  From 18 January 1871 the Crown Prince of Prussia was also heir apparent to the German Empire.  Those heirs who succeeded are shown in bold. Camilla, Duchess of Cornwall, ("née" Camilla Rosemary Shand, previously Parker Bowles; born 17 July 1947), is the second wife of Charles, Prince of Wales, the eldest child and heir apparent of Queen Elizabeth II.  Instead of using the title of Princess of Wales, she uses the title Duchess of Cornwall, her husband's secondary designation.  In Scotland, she is known as the Duchess of Rothesay.  In the event of Charles acceding to the throne, Camilla would become a queen consort; however, an official statement issued by Clarence House on the day of her marriage to Charles announced that she would be known as the Princess Consort. The Crown Prince of Thailand (or Siam; Thai: สยามมกุฎราชกุมาร ; rtgs: Sayammakutratchakuman ) is a title held by the heir apparent to the Thai throne.  First created by King Chulalongkorn (Rama V) in 1886, for his son Prince Maha Vajirunhis, the king's eldest son by a royal wife Queen Savang Vadhana.  Prior to this, the Siamese throne did not have a law or formal system regulating the royal succession.  In 1688 King Petracha of Ayutthaya created the title of Front Palace, which by the Rattanakosin period had become the main title granted to the heir presumptive to the throne.  However few Front Palaces have succeeded to the throne this way, with the exception of King Buddha Loetla Nabhalai (Rama II) in 1809.  After the Front Palace crisis in 1875, the title of Front Palace was abolished and replaced with the title of Crown Prince, who became heir apparent to the throne. Duke of Rothesay (Scottish Gaelic: "Diùc Baile Bhòid" , Scots: "Duik o Rothesay" ) is a dynastic title of the heir apparent to the British throne, currently Prince Charles.  It was a title of the heir apparent to the throne of the Kingdom of Scotland before 1707, of the Kingdom of Great Britain from 1707 to 1801, and now of the United Kingdom of Great Britain and Northern Ireland.  It is the title mandated for use by the heir apparent when in Scotland, in preference to the titles "Duke of Cornwall" (which also belongs to the eldest living son of the monarch, when and only when he is also heir apparent, by right) and "Prince of Wales" (traditionally granted to the heir apparent), which are used in the rest of the United Kingdom and overseas.  The Duke of Rothesay also holds other Scottish titles, including those of Earl of Carrick, Baron of Renfrew, Lord of the Isles and Prince and Great Steward of Scotland.  The title is named after Rothesay on the Isle of Bute, Argyll and Bute, but is not associated with any legal entity or landed property, unlike the Duchy of Cornwall. Hammerschmidt Villa (German: "Villa Hammerschmidt" ) is a villa located in the German city of Bonn that served as the primary official seat and primary official residence of the President of the Federal Republic of Germany from 1950 until 1994.  President Richard von Weizsäcker made Bellevue Palace in Berlin his primary official seat and residence in 1994.  Since 1994, the Hammerschmidt Villa has served as a secondary official seat and secondary official residence for the President.  In German, the Villa is also called the "White House of Bonn", because of its vague resemblance to the official residence of the President of the United States. Clarence House is a royal residence in London, situated on The Mall, in the City of Westminster.  It is attached to St. James's Palace and shares the palace's garden.  For nearly 50 years, from 1953 to 2002, it was home to Queen Elizabeth The Queen Mother.  It has since been the official residence of Charles, Prince of Wales, and Camilla, Duchess of Cornwall. Qian Hongzun (錢弘僔) (925－June 7, 940), formally Heir Apparent Xiaoxian (孝獻世子, "the filial and wise heir apparent"), was an heir apparent to the throne of the Chinese Five Dynasties and Ten Kingdoms Period state Wuyue during most of the reign of his father Qian Yuanguan (né Qian Chuanguan, King Wenmu), but did not inherit the throne on account of his predeceasing his father. Sukhrangpha was the king of Ahom kingdom from 1332 CE to 1364 CE.  He had to face the revolt led by his youngest brother Chao Pulai or Tai Sulai (there are confusion in Ahom historians whether Chao Pulai and Tai Sulai were same or different personality.  Eventually he came in terms with Chao Pulai (or Tai Sulai) by appointing him as Charing Raja, a newly created official post to administer the region of Charing.  Later the post of Charing Raja was usually conferred to the heir apparent to the throne.  It can be compared with the title of Prince of Wales of England, where the heir apparent to the throne was conferred with this title. The Norwegian Royal Family is the family of the Norwegian monarch.  In Norway there is a distinction between the Royal House and the Royal Family.  The Royal House includes only the monarch and their spouse, the heir apparent and their spouse, and the heir apparent's eldest child.  The remaining Royal Family includes also all other children, grandchildren and siblings of the monarch, along with their spouses and widows or widowers.
Answer: Queen Elizabeth II