Instructions: 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: Linkall UAVs are Chinese experimental UAVs developed by Linkall (Linkall 团队) and the two UAVs developed are both VTOL UAVs.
Question: The document can be classified to which topic? 
Options: 1)Film, 2)MeanOfTransportation, 3)Artist, 4)Album, 5)NaturalPlace
Output:
2