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 FS E.645 and E.646 are two classes of similar electric locomotives used on Italian railways. They were introduced during the 1950s and they have been retired in 2009.
Question: The document can be classified to which topic? 
Options: 1)WrittenWork, 2)Athlete, 3)Plant, 4)MeanOfTransportation
[EX A]: 4

[EX Q]: Context: Zheng Huaiying is a former female table tennis player from China.
Question: The document can be classified to which topic? 
Options: 1)Village, 2)Album, 3)Artist, 4)Athlete
[EX A]: 4

[EX Q]: Context: Roger Parent is a Canadian politician who was elected to the Legislative Assembly of Saskatchewan in the 2011 election. He represents the electoral district of Saskatoon Meewasin as a member of the Saskatchewan Party caucus.
Question: The document can be classified to which topic? 
Options: 1)WrittenWork, 2)OfficeHolder, 3)EducationalInstitution, 4)MeanOfTransportation
[EX A]:
2