Conversation so far:
where was Sigmund Freud born?
the Moravian town of Freiberg.
when was he born?
CANNOTANSWER.
where did he go to school?
the University of Vienna.
what did he study?
philosophy under Franz Brentano, physiology under Ernst Brucke, and zoology under Darwinist professor Carl Claus.

Question: when did he graduate?
Self-contained rewrite: when did Sigmund Freud graduate?