Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Cryptogenic organizing pneumonia ?
    ### Response:
    Cryptogenic organizing pneumonia (COP) is a form of idiopathic interstitial pneumonia characterized by lung inflammation and scarring that obstructs the small airways and air sacs of the lungs (alveoli). Signs and symptoms may include flu-like symptoms such as cough, fever, malaise, fatigue and weight loss.
    