Concept:Blisters appearing on the mouth and around the hoof point to a highly contagious viral infection of cloven-hoofed farm animals.
Explanation:Foot and mouth disease mainly affects cattle, sheep, goats, and pigs.
It causes fever, loss of appetite, and formation of blisters on the tongue, gums, mouth lining, and the skin around the hooves.
These blisters burst later, leaving painful sores that make the animal drool and become lame.
Rinderpest mainly affects the digestive tract and does not typically cause hoof blisters.
Anthrax is a bacterial disease that often causes sudden death and swelling, not mouth-and-hoof blisters.
Newcastle disease affects poultry and produces respiratory and nervous signs, not hoof lesions.
Therefore, the symptom described matches only foot and mouth disease.
Answer:D. foot and mouth disease