Task: Text Categorization
Input (English): Context: The Caddo River is a tributary of the Ouachita River in the U.S. state of Arkansas. The river is about 82 miles (132 km) long altogther.
Question: The document can be classified to which topic? 
Options: 1)Village, 2)WrittenWork, 3)Athlete, 4)NaturalPlace, 5)Plant
Output (English): 4