Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Agnosia ?
    ### Response:
    Agnosia is a rare disorder characterized by an inability to recognize and identify objects or persons. People with agnosia may have difficulty recognizing the geometric features of an object or face or may be able to perceive the geometric features but not know what the object is used for or whether a face is familiar or not.
    