Q: 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.
Context: Iznajar Reservoir is a reservoir in the province of Córdoba Andalusia Spain.
Question: The document can be classified to which topic? 
Options: 1)MeanOfTransportation, 2)WrittenWork, 3)EducationalInstitution, 4)NaturalPlace, 5)Building
A:
4