The correct option is
D All of the above
Causes and examples of poultry diseases:
Virus - Newcastle Disease, Avian Encephalomyelitis, Fowl Pox, Marek's Disease, Infectious Bronchitis, Infectious Laryngotracheitis, Duck Virus Hepatitis.
Bacteria - Fowl Cholera, Salmonellosis, Pullorum, Fowl Typhoid, Infectious Sinusitis, Colibacilosis.
Fungus - Aspergillosis: A. flavis (toxins), A. fumigatus (airsaculitis).
Therefore, the correct answer is option D.