Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Ear Infections ?
    ### Response:
    Ear infections are the most common reason parents bring their child to a doctor. Three out of four children will have at least one ear infection by their third birthday. Adults can also get ear infections, but they are less common.    The infection usually affects the middle ear and is called otitis media.
    