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: 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
4

Context: The Udet U 12 Flamingo was an aerobatic sports plane and trainer aircraft developed in Germany in the mid-1920s. It was a conventional single-bay biplane of wooden construction with the wings braced by large I-struts. The pilot and instructor or passenger sat in tandem open cockpits. The U 12 proved extremely popular and sold well due in no small part to Ernst Udet's spectacular aerobatics routines while flying the aircraft.
Question: The document can be classified to which topic? 
Options: 1)Artist, 2)Building, 3)MeanOfTransportation, 4)Company, 5)Plant
3

Context: Roi-Namur /ˌrɔɪ-nəˈmʊər/ is an island in the north part of the Kwajalein atoll in the Marshall Islands. Germany annexed the Marshalls in 1885 but did not put government officials on the islands until 1906 leaving island affairs to a group of powerful German trading companies. Japan took over in 1914 and colonised the Marshalls extensively developing and fortifying large bases on many of the islands.Roi-Namur was the target of the U.S.
Question: The document can be classified to which topic? 
Options: 1)OfficeHolder, 2)Company, 3)EducationalInstitution, 4)Building, 5)Athlete

4