Which statement about Bovidae horns is true?

• A. Bovidae horns have a bony core with keratin sheath that are never shed.
• B. Bovidae horns shed annually.
• C. Bovidae are reptiles.
• D. Bovidae are birds.

Answer: (A)

Understanding horn structure and growth is key. In Bovidae, horns are permanent structures made of a bony core that is continuous with the skull, covered by a keratin sheath. The keratin sheath grows with the animal, but the horn as a whole is never shed—the bone remains attached to the skull. This is why the statement is true. The other ideas don’t fit: Bovidae are mammals, not reptiles or birds, and their horns aren’t shed annually (that annual shedding describes deer antlers, not bovine horns).