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.

Let me give you an example: 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
The answer to this example can be: 3
Here is why: Mansfield Building Society is a UK building society. Hence, option 3 is the correct answer

OK. solve this:
Context: The Graciloceratidae is a family of nautiloid cephalopods from the Middle and Upper Ordovician belonging to the Oncocerida characterized by exogastric cyrtocones that expand slightly or moderately and have thin walled orthochoantic marginal or subventral tubular siphuncles (Sweet 1964).The Graciloceratidae was proposed by Rousseau Flower in 1950 and at that time placed in the Basslerocerida which has since been abandoned. It is now assigned to the Oncocerida (Sweet 1964).
Question: The document can be classified to which topic?
Options: 1)Building, 2)WrittenWork, 3)Athlete, 4)Animal
Answer:
4