Question: What is the date of death of Dola Ben-Yehuda Wittmann's father?
Sentence (from "Nadav Ben Yehuda"): In 2012, while climbing Mount Everest and about 300 meters below the summit, Ben Yehuda encountered an unconscious and severely injured climber from Turkey, and immediately began rescue efforts that also involved his own risk of life.
Relevant evidence: No