Definition: 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.
Input: Context: The Boeing X-50A Dragonfly formerly known as the Canard Rotor/Wing Demonstrator was a gyrodyne unmanned aerial vehicle that was developed by Boeing and DARPA to demonstrate the principle that a helicopter's rotor could be stopped in flight and act as a fixed wing. The X-50A built upon the work of the Sikorsky S-72 X-Wing program of the 1980s by designing the vehicle as a multi-mode aircraft from the ground up.
Question: The document can be classified to which topic?
Options: 1)EducationalInstitution, 2)Building, 3)Film, 4)MeanOfTransportation, 5)Animal
Output:
4