Concept:Identify the rabbit disease caused by a protozoan pathogen.Explanation:Coccidiosis is caused by protozoan parasites belonging to the genus Eimeria.Infectious bronchitis is a viral disease, not a protozoan infection.Anthrax is caused by bacteria, specifically Bacillus anthracis.Milk fever is a metabolic disorder related to calcium deficiency, not an infection.Thus, among the given options, only coccidiosis is caused by a protozoan.Answer:B. coccidiosis