text: <START_QUESTION> i am called white. my duty is to protect and destroy. all it takes is a sneeze and i will destroy. at the sign of a cut, i will come to protect. i will fight to my death. no matter how insignificant it may be. i am very helpful yet you can't see me. what am i? <END_QUESTION>
  <ANSWER> white blood cell <END_ANSWER><|endoftext|>