Circling disease in cattle is caused by

Answer: Option A

Circling disease in cattle is caused by Listeria monocytogenes.
Listeriosis is an infectious but not contagious disease caused by the bacterium Listeria monocytogenes, far more common in domestics animals, especially ruminants, than in human beings.
It is a localized ascending asymmetric infection of the brain stem of ruminants by Listeria monocytogenes.