Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Context: The THK-5 was a twin-engine aircraft developed in Turkey in 1945 as an air ambulance. It was a conventional low-wing cantilever monoplane of wooden construction throughout. The main units of the tailwheel undercarriage retracted into the wing-mounted engine nacelles and the THK-5 could carry two stretcher cases plus a medical attendant.
Question: The document can be classified to which topic?
Options: 1)NaturalPlace, 2)MeanOfTransportation, 3)OfficeHolder, 4)Artist
Student:
2