Q: In this task, you are given a text which is the body of a document. You are given a question and options. Pick the correct number. Don't generate anything else apart from the numbers provided in options.
Context: Halle (Heve) is a river of North Rhine-Westphalia Germany.
Question: The document can be classified to which topic? 
Options: 1)Animal, 2)Film, 3)Artist, 4)Building, 5)NaturalPlace
A:
5