Question: What was the first underground line in the city where the painter of Portrait of Christina of Denmark died?

full_context: Document 1: Portrait of Sir Thomas More (Holbein): The work was created during the period from 1526 when Holbein lived in London. He gained the friendship of the Dutch humanist Desiderius Erasmus, who recommended that he befriend More, then a powerful, knighted speaker at the English Parliament.
Document 2: Portrait of Queen Christina of Denmark: Portrait of Queen Christina of Denmark is late work of the Italian Renaissance master Titian, painted in 1555–1556 as an oil on canvas and now housed in the National Museum of Serbia of Belgrade, Serbia. This painting was part of collection of Mary of Hungary (1505–1558) already in 1556. Before the World War II was part of Contini Bonacossi Collection.
Document 3: Portrait of Henry VIII: Portrait of Henry VIII is a lost work by Hans Holbein the Younger depicting Henry VIII. It was destroyed by fire in 1698, but is still well known through many copies. It is one of the most iconic images of Henry and is one of the most famous portraits of any British monarch. It was originally created in 1536–1537 as part of a mural showing the Tudor dynasty at the Palace of Whitehall, London.
Document 4: The Body of the Dead Christ in the Tomb: The Body of the Dead Christ in the Tomb is an oil and tempera on limewood painting created by the German artist and printmaker Hans Holbein the Younger between 1520–22. The work shows a life-size, grotesque depiction of the stretched and unnaturally thin body of Jesus Christ lying in his tomb. Holbein shows the dead Son of God after he has suffered the fate of an ordinary human.
Document 5: London Underground: The Underground has its origins in the Metropolitan Railway, the world's first underground railway. Opened in 1863, it is now part of the Circle, Hammersmith & City and Metropolitan lines; the first line to operate underground electric traction trains, the City & South London Railway in 1890, is now part of the Northern line. The network has expanded to 11 lines, and in 2016 -- 17 carried 1.379 billion passengers, making it the world's 11th busiest metro system. The 11 lines collectively handle approximately 4.8 million passengers a day.
Document 6: Portrait of Thomas Cromwell: Portrait of Thomas Cromwell is a small oil painting by the German and Swiss artist Hans Holbein the Younger, usually dated to between 1532 and 1534, when Cromwell, an English lawyer and statesman who served as chief minister to King Henry VIII of England from 1532 to 1540, was around 48 years old. It is one of two portraits Holbein painted of him; the other is a tondo from a series of medallions of Tudor courtiers.
Document 7: Railway electrification in Great Britain: The first electric railway in Great Britain was Volk's Electric Railway in Brighton, a pleasure railway, which opened in 1883, still functioning to this day. The London Underground began operating electric services using a fourth rail system in 1890 on the City and South London Railway, now part of the London Underground Northern line. The Liverpool Overhead Railway followed in 1893, being designed from the outset to be electric traction, unlike the City and South London Railway which was designed to be cable hauled initially. Main line electrification of some suburban lines began in the early years of the 20th century, using a variety of different systems. In 1921 a government committee chose 1,500 V DC overhead to be the national standard, but little implementation followed and many different systems co-existed. During the interwar period, the Southern Railway adopted the 660 V DC third rail system as its standard and greatly expanded this system across its network of lines south of London.
Document 8: London Underground: London Underground A deep - level Central line train at Lancaster Gate bound for Ealing Broadway A larger sub-surface Metropolitan line train at Farringdon bound for Aldgate Overview Locale Greater London, Buckinghamshire, Essex, Hertfordshire Transit type Rapid transit Number of lines 11 Number of stations 270 served (260 owned) Daily ridership 5 million Annual ridership 1.379 billion (2016 / 17) Website London Underground Operation Began operation 10 January 1863; 154 years ago (1863 - 01 - 10) Operator (s) London Underground Limited Reporting marks LT (National Rail) Technical System length 402 km (250 mi) Track gauge 1,435 mm (4 ft 8 ⁄ in) standard gauge Electrification 630 V DC fourth rail Average speed 33 km / h (21 mph)
Document 9: Portrait of a Lady with a Squirrel and a Starling: Portrait of a Lady with a Squirrel and a Starling is an oil-on-oak portrait completed in around 1526–1528 by German Renaissance painter Hans Holbein the Younger. The painting shows a demurely dressed young woman sitting against a plain blue background and holding in her lap a squirrel on a chain eating a nut; a starling sits on a fig tree in the background with its beak pointing at her right ear. The subject of this portrait is believed to be Anne Lovell, wife of Sir Francis Lovell (d. 1551), an Esquire of the Body to Henry VIII.
Document 10: Darmstadt Madonna: The Darmstadt Madonna (also known as the Madonna of Jakob Meyer zum Hasen) is an oil painting by Hans Holbein the Younger. Completed in 1526 in Basel, the work shows the Bürgermeister of Basel Jakob Meyer zum Hasen, his first wife (who had died earlier), his current wife, and his daughter grouped around the Madonna and infant Jesus. The meaning of the two other male figures on the left side is, like the overall iconography of the image, not entirely clear. The image testified to the resolutely Catholic faith of the Bürgermeister, who actively opposed the Reformation.
Document 11: Portrait Miniature of Margaret Roper: Portrait Miniature of Margaret Roper is a painting by the German artist and printmaker Hans Holbein the Younger created between 1535–36, and today held in the Metropolitan Museum of Art in New York. Margaret Roper (1505–44) was the eldest child of Sir Thomas More and wife of the English biographer William Roper. It is the second and less well known of two portraits of Roper painted by Holbein. The first, "Portrait of an English Woman", is generally believed to show Roper but may depict another unknown lady of the English court. The New York work was painted during the artist's second visit to London, likely in the mid-1530s.
Document 12: Portrait of Catherine, Duchess of Cambridge: Portrait of Catherine, Duchess of Cambridge is the first official portrait of Catherine, Duchess of Cambridge, unveiled at the National Portrait Gallery, London on 11 January 2013. Paul Emsley was commissioned to paint the Duchess after being selected from a shortlist by Catherine herself. Catherine had announced the National Portrait Gallery as one of her official patronages in January 2012. Emsley took 15 weeks to complete the painting, which was presented to the trustees of the gallery in November 2012. The Duchess, contrary to considerable criticism in the art world, highly praised the portrait after viewing it initially in a private family gathering.
Document 13: London Underground: The system's first tunnels were built just below the surface, using the cut - and - cover method; later, smaller, roughly circular tunnels -- which gave rise to its nickname, the Tube -- were dug through at a deeper level. The system has 270 stations and 250 miles (400 km) of track. Despite its name, only 45% of the system is actually underground in tunnels, with much of the network in the outer environs of London being on the surface. In addition, the Underground does not cover most southern parts of Greater London, with less than 10% of the stations located south of the River Thames.
Document 14: Portrait of Christina of Denmark: Portrait of Christina of Denmark was painted with oil on oak panel by Hans Holbein the Younger in 1538. It was commissioned that year by Thomas Cromwell, agent for Henry VIII, as a betrothal painting following the death of the English Queen Jane Seymour. It shows the then sixteen-year-old Christina of Denmark, widowed Duchess of Milan. She was not a great beauty, but had a striking manner and strength of character. Although Henry was taken by her representations, the marriage proposal did not go ahead; not least because she was aware of Henry's earlier treatment of his wives, and said "If I had two heads, I would happily put one at the disposal of the King of England".
Document 15: List of metro systems: This list of metro systems includes electrified rapid transit train systems worldwide. In some cases, metro systems are referred to as subways, U-Bahns or undergrounds. As of October 2014, 157 cities in 55 countries around the world host the approximately 160 metro systems that are listed here. The London Underground first opened as an ``underground railway ''in 1863 and its first electrified underground line opened in 1890, making it the world's first metro system. The metro system with the longest route length is the Shanghai Metro; the busiest one is the Beijing Subway; and the one with the most stations is the New York City Subway.
ground_truth: City & South London Railway
sub_queries: Which was the creator of Portrait of Christina of Denmark? Answer: Hans Holbein
Hans Holbein >> place of death Answer: London
what was the first underground line in London Answer: City & South London Railway