The correct option is D Ranikhet
Bird flu occurs naturally in wild waterfowl and can spread into domestic poultry, such as chickens, turkeys, ducks and geese. The disease is transmitted via contact with an infected bird's feces, or secretions from its nose, mouth or eyes.
Ranikhet disease is caused by a virus. This virus is a single-stranded RNA genome virus that generally affects the lower respiratory tract. This disease occurs in birds like domesticated fowl, ducks, geese, hens and turkey.