I believe the answer is E) Input
If your immune system attacks your own body parts, then it's called 'autoimmune disease'.
Autoimmune disease can happen at many times due to many problems the body can have. If one thing goes wrong with your body, it can go to another.
The fly lays eggs, which turn into maggots. "Maggot" is another word for larva. After a pupal stage, maggots turn into flies.