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.

Example input: Text: The Mansfield Building Society is a UK building society which has its headquarters in Mansfield Nottinghamshire. It is a member of the Building Societies Association.
Question: The document can be classified to which topic? Options: 1)Animal, 2)Plant, 3)Building, 4)Company, 5)WrittenWork
Example output: 3
Example explanation: Mansfield Building Society is a UK building society. Hence, option 3 is the correct answer
Q: Context: Cidlina (Czech pronunciation: [tsdlna]) is a river in the Czech Republic draining south from its source in Tabor hill near Lomnice nad Popelkou through Jicin Novy Bydzov and Chlumec nad Cidlinou merging with the Elbe (Labe) at Libice nad Cidlinou. Cidlina is 87.3 kilometers long its drainage area covers 1164 km and average discharge is 4.66 m/s.
Question: The document can be classified to which topic?
Options: 1)MeanOfTransportation, 2)Artist, 3)OfficeHolder, 4)NaturalPlace, 5)Athlete
A:
4