Question: Who is the paternal grandmother of Ferdinand Zvonimir Von Habsburg?

Knowledge 1: Ferdinand Zvonimir von Habsburg
Ferdinand Zvonimir Maria Balthus Keith Michael Otto Antal Bahnam Leonhard von Habsburg-Lothringen, known colloquially as Ferdinand Habsburg (born 21 June 1997, in Salzburg), is an Austrian motor racing driver and the eldest son of Karl von Habsburg.A member of the House of Habsburg-Lorraine, he is considered first in the line of succession to the former Austro-Hungarian throne.Habsburg competes in the Deutsche Tourenwagen Masters (DTM).In November 2017, he finished 4th in the 2017 Macau Grand Prix after crashing at the final corner of the last lap whilst attempting to complete an overtake for the lead.He has also raced in the FIA Formula 3 European Championship. [SEP] Knowledge 2: Karl von Habsburg
Karl von Habsburg (Karl Thomas Robert Maria Franziskus Georg Bahnam; born 11 January 1961), also known as Karl of Austria and referred to by his ancestral titles as Archduke of Austria, Royal Prince of Hungary, Bohemia and Croatia, is an Austrian politician, the current head of the House of Habsburg-Lorraine which ruled the lands of the Habsburg Monarchy, the Empire of Austria, the Austro-Hungarian Monarchy, and the Kingdom of Hungary as well as the Crown lands of Bohemia and Croatia by hereditary right until the end of World War I. Born in Starnberg, Germany, in 1961, he is the son of Archduke Otto von Habsburg, Crown Prince of Austria and Princess Regina of Saxe-Meiningen, and the grandson of the last Austrian emperor, Charles I.He served as a Member of the European Parliament for the Austrian People's Party 1996–1999.Like his father, he is known as an advocate for the Pan-European movement.
Knowledge 1: Andrea von Habsburg
Andrea von Habsburg(" Andrea Maria von Habsburg- Lothringen") Archduchess of Austria, Hereditary Countess of Neipperg,( born 30 May 1953, in Würzburg, Bavaria), is the first child and oldest daughter of Otto von Habsburg and his wife, Princess Regina of Saxe- Meiningen. [SEP] Knowledge 2: Michaela von Habsburg
Michaela von Habsburg(" Michaela Maria Madeleine Kiliana Habsburg- Lothringen") was born 13 September 1954, in Würzburg.She is the twin sister of Monika von Habsburg, and daughter of Otto von Habsburg and Princess Regina of Saxe- Meiningen.
Knowledge 1: Ferdinand Zvonimir von Habsburg
Ferdinand Zvonimir Maria Balthus Keith Michael Otto Antal Bahnam Leonhard von Habsburg-Lothringen, known colloquially as Ferdinand Habsburg (born 21 June 1997, in Salzburg), is an Austrian motor racing driver and the eldest son of Karl von Habsburg.A member of the House of Habsburg-Lorraine, he is considered first in the line of succession to the former Austro-Hungarian throne.Habsburg competes in the Deutsche Tourenwagen Masters (DTM).In November 2017, he finished 4th in the 2017 Macau Grand Prix after crashing at the final corner of the last lap whilst attempting to complete an overtake for the lead.He has also raced in the FIA Formula 3 European Championship. [SEP] Knowledge 2: Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.

Answer: Princess Regina of Saxe-Meiningen