One thing that the attendees of the Wannsee Conference disagreed on was C. who qualified as a Jew and who did not.
The Wannsee Conference was called by the head of the SS, Reinhard Heydrich, who wanted to foster cooperation between the various departments of the Nazi Germany regime as they attempted to commit the mass genocide of Jews.
There was however an argument as to who constituted a Jew so that they would be deported and then sent off to their execution. Some were of the opinion that even having a Jewish grandparent meant that they were Jewish and so should be exterminated.
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