Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Anesthesia ?
    ### Response:
    If you are having surgery, your doctor will give you medicine called an anesthetic. Anesthetics reduce or prevent pain. There are three main types:       - Local - numbs one small area of the body. You stay awake and alert.    - Regional - blocks pain in an area of the body, such an arm or leg.
    