Question: Am Spiegelgrund was the name of a children's clinic in Vienna where 789 children were killed under the Aktion T4, was a postwar name for mass murder through involuntary euthanasia in which Nazi controlled country?
Sentence (from "Am Spiegelgrund clinic"): Am Spiegelgrund was the name of a children's clinic in Vienna where 789 children were killed under the Nazi Regime Children's Euthanasia Program, also known as Aktion T4.
Relevant evidence: Yes