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 Kyushu K11W Shiragiku ( White Chrysanthemum) made by the Kyushu Aircraft Company was a land-based bombing trainer aircraft which served in the Imperial Japanese Navy Air Service in the latter years of World War II. As indicated by its Japanese designation training aircraft for on-board work ( kijo sagyo renshu-ki?) it was designed to train crews in operating equipment for bombing navigation and communication as well as navigation techniques.
Question: The document can be classified to which topic?
Options: 1)Plant, 2)OfficeHolder, 3)MeanOfTransportation, 4)EducationalInstitution, 5)WrittenWork
3