Given a scientific question, generate a correct answer to it.

[Q]: What type of disease occurs when the immune system fails to recognize the body's own molecules?
[A]: autoimmune

[Q]: What third property is different if two boxes have the same volume but one has greater mass?
[A]: density

[Q]: What is the name for the energy required for an electron to be added to a neutral atom in its gaseous form?
[A]:
electron affinity