Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Mercury poisoning ?
    ### Response:
    Mercury poisoning is a condition that occurs in people who are exposed to toxic levels of the element, mercury. There are three different forms of mercury that can cause health problems: Elemental mercury (also known as liquid mercury or quicksilver) can be found in glass thermometers, electrical switches, dental fillings and fluorescent light bulbs.
    