Definition: 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.
Input: Context: The Valea Adâncă River is a tributary of the Carasu Branch of the Danube-Black Sea Canal in Romania.
Question: The document can be classified to which topic? 
Options: 1)Album, 2)Building, 3)Artist, 4)NaturalPlace

4