An outbreak of a disease in an animal population is known as:

Correct option is A

An epizootic refers to the sudden outbreak and rapid spread of a disease in an animal population, similar to an epidemic in humans. It occurs when the incidence rate of the disease significantly exceeds the normal expected level, potentially causing mass illness or mortality among animals.
Explanation of options: (a) Epizootic – This is the correct answer. It signifies an abnormal increase in disease occurrence among animal groups. (b) Enzootic – Refers to a constant presence of a disease within a particular animal population, like endemic in humans. (c) Exotic – Describes diseases not normally present in a region or country and are typically introduced from outside. (d) Sporadic – Means diseases that occur infrequently and irregularly, not in outbreak form.