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 Piracuruca River is a river of Piauí state in northeastern Brazil.
Question: The document can be classified to which topic? 
Options: 1)Building, 2)Animal, 3)NaturalPlace, 4)OfficeHolder, 5)WrittenWork
[EX A]: 3

[EX Q]: Context: Conoco Inc. was an American oil company founded in 1875 as the Continental Oil and Transportation Company. It is now a brand of gasoline and service station in the United States which belongs to the ConocoPhillips Company. Before the 2002 merger with Phillips Conoco had its headquarters in what is now the current ConocoPhillips headquarters in the Energy Corridor of Houston formerly known as the Conoco Center.
Question: The document can be classified to which topic? 
Options: 1)Company, 2)Animal, 3)Plant, 4)Athlete, 5)Building
[EX A]: 1

[EX Q]: Context: Operation Columbus is a juvenile science fiction novel the third in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1959 in the US by Criterion Books in 1960 under the title First on the Moon and in the Netherlands by Prisma Juniores as 'Wedloop naar de Maan' 1963.
Question: The document can be classified to which topic? 
Options: 1)WrittenWork, 2)MeanOfTransportation, 3)NaturalPlace, 4)Film
[EX A]:
1