Question: What is the date of death of Katia Mann's husband?
Sentence (from "Katia Mann"): Katia Mann (born Katharina Hedwig Pringsheim; July 24, 1883 – April 25, 1980) was the youngest child and only daughter (among four sons) of the German Jewish mathematician and artist Alfred Pringsheim and his wife Hedwig Pringsheim, who was an actress in Berlin before her marriage.
Relevant evidence: No