Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Bereavement ?
    ### Response:
    Bereavement is the period of grief and mourning after a death. When you grieve, it's part of the normal process of reacting to a loss. You may experience grief as a mental, physical, social or emotional reaction. Mental reactions can include anger, guilt, anxiety, sadness and despair.
    