Task: Text Categorization
Input (English): Context: Flabellina cerverai is a species of sea slug an aolid nudibranch a marine gastropod mollusk in the family Flabellinidae.
Question: The document can be classified to which topic? 
Options: 1)WrittenWork, 2)Athlete, 3)NaturalPlace, 4)Animal, 5)MeanOfTransportation
Output (English): 4