The correct answer is (C) A group marked by common characteristics; the normal major subdivision of a family or subfamily in the classification of plants and animals, usually consisting of more than one species; any group of animals or plants within a family; the generic name, which joined with the specific name, constitutes an organism's scientific name.

Genus comes from Latin gnus (birth), Greek genos.

Examples of use:

• Cats belong to the genus termed Felis.
• Each species differs in a particular aspect from others species in the genus.