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 Beriev MBR-2 was a reconnaissance flying boat which entered service with the Soviet Navy in 1935.
Question: The document can be classified to which topic? 
Options: 1)NaturalPlace, 2)Building, 3)MeanOfTransportation, 4)Album

3