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.

Example input: 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
Example output: 3
Example explanation: Mansfield Building Society is a UK building society. Hence, option 3 is the correct answer
Q: Context: Azolla filiculoides (Water Fern) is a species of Azolla native to warm temperate and tropical regions of the Americas as well as most of the old world including Asia and Australia. It is a floating aquatic fern with very fast growth capable of spreading over lake surfaces to give complete coverage of the water in only a few months. Each individual plant is 1-2 cm across green tinged pink orange or red at the edges branching freely and breaking into smaller sections as it grows.
Question: The document can be classified to which topic?
Options: 1)Company, 2)Village, 3)Animal, 4)Plant
A:
4