Task: Question Answering
Input (English): Rheumatoid arthritis is an autoimmune disease that affects the joints. Which of these events causes the symptoms of this disease?  
 (A) The body's immune system attacks specific tissues. (B) The cells of the immune system begin to grow rapidly. (C) The body's immune system fails to fight off infections. (D) The cells of the immune system are absorbed by antigens.
Output (English): A