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: HMS Strongbow was an S class submarine of the Royal Navy and part of the Third Group built of that class.
Question: The document can be classified to which topic?
Options: 1)EducationalInstitution, 2)Film, 3)Plant, 4)MeanOfTransportation, 5)Building
A:
4