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.

Q: Context: Lautenbach (Ablach) is a river of Baden-Württemberg Germany.
Question: The document can be classified to which topic? 
Options: 1)MeanOfTransportation, 2)Film, 3)WrittenWork, 4)NaturalPlace, 5)Company

A: 4
****
Q: Context: Sword Art Online (ソードアート・オンライン Sōdo Āto Onrain) is a Japanese light novel series written by Reki Kawahara and illustrated by abec. The series takes place in the near-future and focuses on various virtual reality MMORPG worlds. The light novels began publication on ASCII Media Works' Dengeki Bunko label from April 10 2009 with a spin-off series launching in October 2012 and are licensed in North America by Yen Press. The series has spawned five manga adaptations.
Question: The document can be classified to which topic? 
Options: 1)OfficeHolder, 2)NaturalPlace, 3)Company, 4)WrittenWork, 5)Plant

A: 4
****
Q: Context: Memphis is a village in Saunders County Nebraska United States. The population was 114 at the 2010 census.
Question: The document can be classified to which topic? 
Options: 1)WrittenWork, 2)MeanOfTransportation, 3)NaturalPlace, 4)Village, 5)Animal

A:
4
****