Given the task definition and input, reply with output. 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: Lake Apanas is a reservoir located in the north of Nicaragua. It is created by Mancotal Dam on the Rio Tuma to the north of Jinotega. The reservoir has an area of 51 square kilometers.It is a source of much of nation's hydropower for the Centro America Plant.
Question: The document can be classified to which topic?
Options: 1)Animal, 2)Athlete, 3)EducationalInstitution, 4)MeanOfTransportation, 5)NaturalPlace
5