You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

Text: The Mansfield Building Society is a UK building society which has its headquarters in Mansfield Nottinghamshire. It is a member of the Building Societies Association.
Question: The document can be classified to which topic? Options: 1)Animal, 2)Plant, 3)Building, 4)Company, 5)WrittenWork
Solution: 3
Why? Mansfield Building Society is a UK building society. Hence, option 3 is the correct answer

New input: Context: The black mussel Choromytilus meridionalis is a species of bivalve. It is a marine mollusc in the family Mytilidae.
Question: The document can be classified to which topic?
Options: 1)Building, 2)WrittenWork, 3)Artist, 4)OfficeHolder, 5)Animal
Solution:
5