Task: Text Categorization
Input (English): Context: The Neštin-class minesweeper is a class of minesweeper built specifically for naval mine clearing duties on rivers. The class was built for the needs of the Yugoslav Navy on the Danube river and was also sold to Hungary and Iraq during the 1970s and '80s.
Question: The document can be classified to which topic? 
Options: 1)NaturalPlace, 2)Animal, 3)Building, 4)OfficeHolder, 5)MeanOfTransportation
Output (English): 5