Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Autoimmune diseases occur when the immune system fails to recognize the body's own molecules as "self," or belonging to the person. Instead, it attacks body cells as though they were dangerous pathogens. There are more than 80 known autoimmune diseases. Recall that regulatory T cells help regulate the immune system. When autoimmune disorders occur, these regulatory T cells fail in their function. This results in damage to various organs and tissues. The type of autoimmune disorder depends on the type of body tissue that is affected. Answer: autoimmune
Output:
What type of disease occurs when the immune system fails to recognize the body's own molecules?