This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neurotic, Stress Related and Somatoform Disorders, Subject name: Psychiatry
[{'content': "A girl feels very depressed as her father died one month back. She feels moody and won't join with others and she thinks about joining her father. The most likely diagnosis is: \nSelect and explain. \nA. Post traumatic stress disorder, B. Grief, C. Depression, D. Bipolar disorder", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Feeling depressed, mood changes and longing after death of a loved one are all suggestive of grief. Normal grief - up to 6 months Complicated grief -Prolonged grief with intense emotions', 'role': 'assistant'}]