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: Tropheus is a small genus of six species of cichlids endemic to Lake Tanganyika in East Africa. The genus Tropheus is widespread across all regions of lake Tanganyika from Burundi in the North to Zambia in the South.Males and females are relatively similar but do display obvious sexual dimorphism. Males attain a somewhat larger size. All species maternally mouthbrood their eggs and fry and it is this characteristic that provides their latin name.
Question: The document can be classified to which topic?
Options: 1)Company, 2)Plant, 3)Animal, 4)EducationalInstitution, 5)NaturalPlace
A:
3