Detailed Instructions: 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.
Q: Context: Mistel is a river of Bavaria Germany.
Question: The document can be classified to which topic? 
Options: 1)NaturalPlace, 2)WrittenWork, 3)Album, 4)EducationalInstitution
A:
1