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: The Beriev Be-4 (originally designated KOR-2) was a reconnaissance flying boat built to operate from Soviet warships during World War II.
Question: The document can be classified to which topic?
Options: 1)Animal, 2)MeanOfTransportation, 3)NaturalPlace, 4)Building, 5)Athlete
Output:
2