Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Infertility ?
    ### Response:
    Infertility means not being able to become pregnant after a year of trying. If a woman can get pregnant but keeps having miscarriages or stillbirths, that's also called infertility.    Infertility is fairly common. After one year of having unprotected sex, about 15 percent of couples are unable to get pregnant.
    