Question: What is the date of death of Mårten Palme's mother?
Sentence (from "Lisbeth Palme"): Anna Lisbeth Christina Palme, née Beck-Friis (also sometimes spelled Lisbet Palme; 14 March 1931 – 18 October 2018), was a Swedish children's psychologist, UNICEF chairwoman and the wife of Swedish prime minister Olof Palme, who was assassinated in 1986.
Relevant evidence: Yes