Task: Text Categorization
Input (English): Context: Lahnavesi is a medium-sized lake in the Kymijoki main catchment area. It is located in the Southern Savonia region in Finland.
Question: The document can be classified to which topic? 
Options: 1)Artist, 2)MeanOfTransportation, 3)Plant, 4)NaturalPlace, 5)Athlete
Output (English): 4