You will be given a definition of a task first, then some input of the task.
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: The Kander is a river in Switzerland. It is 44 kilometres (27 mi) long and has a watershed of 1126 square kilometres (435 sq mi). Originally a tributary of the Aar river with a confluence downstream of the city of Thun since 1714 it has flowed into Lake Thun upstream of the city. The valley through which the river flows is known as the Kandertal or in specific sections as the Gastertal or Frutigtal.
Question: The document can be classified to which topic?
Options: 1)Village, 2)NaturalPlace, 3)Animal, 4)Building
Output:
2