Question: What is a social security number in the country having the gallery displaying The Woman Taken in the main subject of milkman joke?

full_context: Document 1: Milkman joke: In English-speaking culture, a milkman joke is a class of joke exploiting fear of adultery and mistaken paternity. This class of jokes has its roots in the early part of the 20th century, prior to the regular availability of milk in supermarkets. At that time, milk in glass bottles was delivered directly to customers' houses by milkmen, generally in the morning (at which time empty bottles were also collected). Men were commonly the main financial supporters of their families, and a man's wife tended to remain at home to care for their children and home. As the milkman would visit the home at a time when the husband would be away at work, this created an opportune situation for adultery.
Document 2: A Woman Drinking with Two Men: A Woman Drinking with Two Men is a 1658 painting by Pieter de Hooch, an example of Dutch Golden Age painting and is part of the collection of the National Gallery, London.
Document 3: National Insurance number: The National Insurance number is a number used in the United Kingdom in the administration of the National Insurance or social security system. It is also used for some purposes in the UK tax system. The number is described by the United Kingdom government as a ``personal account number ''.
Document 4: Milk: As an agricultural product, milk is extracted from non-human mammals during or soon after pregnancy. Dairy farms produced about 730 million tonnes of milk in 2011, from 260 million dairy cows. India is the world's largest producer of milk, and is the leading exporter of skimmed milk powder, yet it exports few other milk products. The ever increasing rise in domestic demand for dairy products and a large demand - supply gap could lead to India being a net importer of dairy products in the future. The United States, India, China and Brazil are the world's largest exporters of milk and milk products. China and Russia were the world's largest importers of milk and milk products until 2016 when both countries became self - sufficient, contributing to a worldwide glut of milk.
Document 5: The Amorous Milkman: The Amorous Milkman is a 1975 British comedy film directed by Derren Nesbitt and starring Julie Ege, Diana Dors and Brendan Price. The plot follows a young milkman who enjoys a number of adventures with bored women on his round. One version of the poster showed a self-satisfied cat licking its lips above the tagline, "If your pussy could only talk."
Document 6: Royal Institute of British Architects: In 2004, the two institutions created the Architecture Gallery (Room 128) at the V&A showing artefacts from the collections of both institutions, this was the first permanent gallery devoted to architecture in the UK. The adjacent Architecture Exhibition Space (Room 128a) is used for temporary displays related to architecture. Both spaces were designed by Gareth Hoskins Architects. At the same time the RIBA Library Drawing and Archives Collections moved from 21 Portman Place to new facilities in the Henry Cole Wing at the V&A. Under the Partnership new study rooms were opened where members of the public could view items from the RIBA and V&A architectural collections under the supervision of curatorial staff. These and the nearby education room were designed by Wright & Wright Architects.
Document 7: Pub: Until the 1970s most of the larger pubs also featured an off-sales counter or attached shop for the sales of beers, wines and spirits for home consumption. In the 1970s the newly built supermarkets and high street chain stores or off-licences undercut the pub prices to such a degree that within ten years all but a handful of pubs had closed their off-sale counters, which had often been referred to colloquially as the jug and bottle.
Document 8: Social Security number: In the United States, a Social Security number (SSN) is a nine - digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the Social Security Act, codified as 42 U.S.C. § 405 (c) (2). The number is issued to an individual by the Social Security Administration, an independent agency of the United States government. Although its primary purpose is to track individuals for Social Security purposes, the Social Security number has become a de facto national identification number for taxation and other purposes.
Document 9: London: London is home to many museums, galleries, and other institutions, many of which are free of admission charges and are major tourist attractions as well as playing a research role. The first of these to be established was the British Museum in Bloomsbury, in 1753. Originally containing antiquities, natural history specimens and the national library, the museum now has 7 million artefacts from around the globe. In 1824 the National Gallery was founded to house the British national collection of Western paintings; this now occupies a prominent position in Trafalgar Square.
Document 10: Self-portrait by Judith Leyster: Self-portrait by Judith Leyster is an Dutch Golden Age painting in oils in the collection of the National Gallery of Art that was offered in 1633 as a masterpiece to the Haarlem Guild of St. Luke. It was attributed for centuries to Frans Hals and was only properly attributed to Judith Leyster upon acquisition by the museum in 1949. The style is indeed comparable to that of Hals, Haarlem's most famous portraitist.
Document 11: Social Security number: Social Security numbers were first issued by the Social Security Administration in November 1935 as part of the New Deal Social Security program. Within three months, 25 million numbers were issued.
Document 12: National Insurance: NI was first introduced by the National Insurance Act 1911 and expanded by the Labour government in 1948. The system was subjected to numerous amendments in succeeding years.
Document 13: The Storm on the Sea of Galilee: The Storm on the Sea of Galilee is a 1633 painting by the Dutch Golden Age painter Rembrandt van Rijn. It was previously in the Isabella Stewart Gardner Museum in Boston, but was stolen in 1990 and remains missing. The painting depicts the miracle of Jesus calming the storm on the Sea of Galilee, specifically as it is described in the fourth chapter of the Gospel of Mark. It is Rembrandt's only seascape.
Document 14: Micro gallery: A micro gallery was a computer-based guide to archives and museum collections, first developed for the collections at the National Gallery in London, UK It took three years to develop by the company Cognitive Applications, and opened in July 1991 as part of the facilities in the Sainsbury Wing. Visitors could use the system to determine which pictures they would like to see in the gallery. It was possible to print out personalised information for use during the visit. The Micro Gallery ran for 14 years and a CD-ROM with similar facilities was produced.
Document 15: The Woman Taken in Adultery (Rembrandt): The Woman Taken in Adultery is a painting of 1644 by Rembrandt, bought by the National Gallery, London in 1824, as one of their foundation batch of paintings. It is in oil on oak, and 83.8 x 65.4 cm.
ground_truth: The National Insurance number
sub_queries: milkman joke >> main subject Answer: adultery
The Woman Taken in adultery >> location Answer: National Gallery
National Gallery >> country Answer: UK
what is a social security number in the UK Answer: The National Insurance number