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.

[EX Q]: Context: The Flying Circus of Physics by Jearl Walker (1975 published by John Wiley and Sons second edition in 2006) is a book that poses (and answers) about a thousand questions concerned with everyday physics.
Question: The document can be classified to which topic? 
Options: 1)Village, 2)OfficeHolder, 3)Album, 4)Artist, 5)WrittenWork
[EX A]: 5

[EX Q]: Context: The Ciobu River is a tributary of the Teleajen River in Romania.
Question: The document can be classified to which topic? 
Options: 1)NaturalPlace, 2)Artist, 3)EducationalInstitution, 4)Film, 5)WrittenWork
[EX A]: 1

[EX Q]: Context: Snowdrift Lake (also Murphy Lakes) is a lake in Grand County Colorado United States. It is part of Rocky Mountain National Park. Snowdrift Lake lies at an elevation of 11069 feet (3374 m) below Snowdrift Peak.
Question: The document can be classified to which topic? 
Options: 1)EducationalInstitution, 2)NaturalPlace, 3)Building, 4)MeanOfTransportation
[EX A]:
2