The correct option is A Thrush
Fowl pox is a viral disease in hens, turkeys and many other birds, characterized by cutaneous lesions on the feather-less skin, mucous coats of the upper alimentary and respiratory tract. Candidiasis, also known as thrush, is caused by the yeast fungus Candida albicans. It is a disease of the alimentary tract of chickens, turkeys, and sometimes other birds and mammals, characterised by thickening and white plaques on the mucosa. Ranikhet disease is also called as Newcastle disease is caused by viruses in the serotype avian paramyxovirustype 1 (APMV-1). These viruses, which are called either APMV-1 or Newcastle disease viruses (NDV), are members of the genus Avulavirus in the family Paramyxoviridae.