Question:
Which employer did Felix Klein work for in Dec, 1885?

Context:
 Felix Klein works for University of Göttingen from Jan, 1886 to Jan, 1913. 
 Felix Klein works for Leipzig University from Jan, 1880 to Jan, 1886. 
 Felix Klein works for University of Erlangen-Nuremberg from Jan, 1872 to Jan, 1875. 
 Felix Klein works for Technical University of Munich from Jan, 1875 to Jan, 1880.

Answer:
Leipzig University