Task: Text Categorization
Input (English): Context: The Juba River (Mato Grosso) is a river of Mato Grosso state in western Brazil.
Question: The document can be classified to which topic? 
Options: 1)MeanOfTransportation, 2)OfficeHolder, 3)Building, 4)NaturalPlace, 5)Artist
Output (English): 4