question: Who is younger, John Duncan Macfarlane or Andrés Manuel Del Río?
context: [["John Duncan MacFarlane", ["John Duncan MacFarlane (July 27, 1892 \u2013 December 8, 1982) was a Scottish-born farmer and political figure in Saskatchewan.", "He represented Melfort from 1934 to 1938 as a Liberal.", "He was born in Gargunnock and was educated in Scotland.", "He later worked for a law office in Stirling.", "In 1910, MacFarlane came to Canada, where he worked on farms and eventually earned his engineer's certificate.", "He graduated from the University of Saskatchewan in agriculture.", "MacFarlane served with the Royal Canadian Engineers and then with the Royal Flying Corps during World War I.", "After the war, he worked for the Soldier Settlement Board for three years.", "MacFarlane then settled on a farm near Carlea, Saskatchewan, where he raised Clydesdale horses, Shorthorn cattle, Yorkshire pigs, Shropshire sheep and Barred Rock chickens.", "He also served on the Alysham School Board.", "In 1920, he married Jean Gray.", "MacFarlane was defeated by Oakland Woods Valleau when he ran for reelection in 1938.", "He was a director for the United Grain Growers from 1947 to 1968 and was president of the Saskatchewan Registered Seed Growers plant at Moose Jaw.", "From 1930 to 1933, he was president of the Saskatchewan Agricultural Societies Association.", "MacFarlane was named to the Saskatchewan Agricultural Hall of Fame in 1979."]], ["Hippolyte-Victor Collet-Descotils", ["Hippolyte- Victor Collet- Descotils( November 21, 1773 in Caen \u2013 December 6, 1815 in Paris) was a French chemist.", "He studied in the \u00c9cole des Mines de Paris, and was a student and friend of Louis Nicolas Vauquelin.", "He is best known for confirming the discovery of chromium by Vauquelin, and for independently discovering iridium in 1803.", "In 1806, Collet- Descotils misidentified erythronium, a new element discovered in Mexico by Andr\u00e9s Manuel del R\u00edo, thinking that it was chromium.", "This resulted in Alexander von Humboldt rejecting Del R\u00edo's discovery.", "The same element was rediscovered thirty years later in Sweden and renamed as vanadium.", "In 1815, a few months before his death, he got the position of director of \u00c9cole des Mines de Paris, in charge of transferring the school to a new building.", "He is buried in the 10th Division of the P\u00e8re Lachaise Cemetery of Paris."]], ["Nils Gabriel Sefstr\u00f6m", ["Nils Gabriel Sefstr\u00f6m( 2 June 1787 \u2013 30 November 1845) was a Swedish chemist.", "Sefstr\u00f6m was a student of Berzelius and, when studying the brittleness of steel in 1830, he rediscovered a new chemical element, to which he gave the name vanadium.", "Vanadium was first discovered by the Spanish- Mexican mineralogist Andr\u00e9s Manuel del R\u00edo in 1801.", "He named it erythronium.", "Friedrich W\u00f6hler later confirmed that vanadium and erythronium were the same substance.", "Sefstr\u00f6m was member of the Royal Swedish Academy of Sciences from 1815.", "The Spitzbergen glacier Sefstr\u00f6mbreen, and the mountain ridge of Sefstr\u00f6mkammen, are named after him."]], ["Andr\u00e9s Manuel del R\u00edo", ["Andr\u00e9s Manuel del R\u00edo y Fern\u00e1ndez( 10 November 1764 \u2013 23 March 1849) was a Spanish \u2013 Mexican scientist, naturalist and engineer who discovered compounds of\" vanadium\" in 1801.", "He proposed that the element be given the name\" panchromium\", or later,\" erythronium\", but his discovery was not credited at the time, and his names were not used."]], ["John Duncan (harpist)", ["John Duncan( 1904\u20131998) was a 20th- century harpist."]], ["John Duncan (painter)", ["John Duncan( 1866\u20131945) was a Scottish painter."]], ["H\u00e9ctor Manuel del Villar Mart\u00ednez", ["H\u00e9ctor Manuel del Villar Mart\u00ednez( 23 September 1937 \u2013 5 February 2017) was a Mexican politician affiliated with the Institutional Revolutionary Party.", "He served as Municipal President of Aguascalientes from 1987 to 1989."]], ["John Duncan (botanist)", ["John Duncan( 19 December 1794 \u2013 9 August 1881) was a Scottish weaver and botanist."]], ["Jos\u00e9 Manuel del R\u00edo", ["Jos\u00e9 Manuel del R\u00edo Virgen( born January 8, 1954) is a Mexican politician affiliated with Convergence who currently serves in the lower house of the Mexican Congress."]], ["John Duncan (traveller in Africa)", ["John Duncan( 1805\u20131849) was a Scottish traveller in Africa."]]]
supporting_facts: [["John Duncan MacFarlane", 0], ["Andr\u00e9s Manuel del R\u00edo", 0]]
evidences: [["John Duncan MacFarlane", "date of birth", "July 27, 1892"], ["Andr\u00e9s Manuel del R\u00edo", "date of birth", "10 November 1764"]]
answer: John Duncan Macfarlane