Which Pair of Organisms is a Good Example of Commensalism

Question

Which pair of organisms is a good example of commensalism?
A) bacteria and legumes
B) cattle egrets and cattle
C) plants and pollinators
D) tapeworms and pigs

Accepted Answer

Cattle egrets and cattle exhibit a commensal relationship where the egrets benefit from feeding on insects stirred up by the grazing cattle, while the cattle are neither harmed nor benefited.