instruction:
Given a scientific question, generate a correct answer to it.
question:
What type of disease occurs when the immune system fails to recognize the body's own molecules?
answer:
autoimmune

question:
Oxygenated air, taken in during inhalation, diffuses across the surface of the lungs into the what?
answer:
bloodstream

question:
The nail bed is a specialized structure of the epidermis that is found at the tips of our what?
answer:
fingers and toes