question: What is the place of birth of Ernst L. Freud's mother?
context: [["Esther Freud", ["Esther Freud( born 2 May 1963) is a British novelist."]], ["Princess Eleonore of Solms-Hohensolms-Lich", ["Princess Eleonore of Solms- Hohensolms- Lich( 17 September 1871 \u2013 16 November 1937), was the second wife of Ernst- Ludwig, Grand Duke of Hesse and by Rhine and the mother of his two sons.", "She was nicknamed\" Onor\" by her family."]], ["Matthew Freud", ["Matthew Freud( born 2 November 1963) is head of Freud Communications, an international public relations firm in the United Kingdom."]], ["Paul Freud", ["Paul Freud,( born 7 April 1959) is a British painter."]], ["Bella Freud", ["Bella Freud( born 17 April 1961) is a London- based fashion designer."]], ["Emma Freud", ["Emma Vallencey Freud( born 25 January 1962) is an English broadcaster and cultural commentator."]], ["Reni Erkens", ["Renate\" Reni\" Erkens( later\" K\u00fcppers\", 24 June 1909 \u2013 22 October 1987) was a German freestyle swimmer who competed in the 1928 Summer Olympics.", "She was born in Oberhausen and was the wife of Ernst K\u00fcppers and the mother of Ernst- Joachim K\u00fcppers.", "In 1928 she finished fourth with the German relay team in the 4\u00d7100 metre freestyle relay competition.", "She also participated in the 100 metre freestyle event and in the 400 metre freestyle event but in both she was eliminated in the first round."]], ["Ernst L. Freud", ["Ernst L. Freud (6 April 1892, in Vienna \u2013 7 April 1970, in London) was an Austrian architect and the fourth child of Austrian psychoanalyst Sigmund Freud and his German-born wife Martha Bernays.", "In honour of his wife, Ernst Freud added the initial L. to his name when he married in early 1920, making the middle initial stand for Lucie and not Ludwig as is often assumed."]], ["Martha Bernays", ["Martha Bernays (26 July 1861 \u2013 2 November 1951) was the wife of Austrian psychoanalyst Sigmund Freud.", "Bernays was the second daughter of Emmeline and Berman Bernays.", "Her paternal grandfather Isaac Bernays was a Chief Rabbi of Hamburg."]], ["Minamoto no Chikako", ["She was the mother of Prince Morinaga."]]]
supporting_facts: [["Ernst L. Freud", 0], ["Martha Bernays", 2]]
evidences: [["Ernst L. Freud", "mother", "Martha Bernays"], ["Martha Bernays", "place of birth", "Hamburg"]]
answer: Hamburg