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': 'Two months after knowing that his son was suffering from leukemia, a 45 year old father presents with sleep deprivation, lethargy, headache, and low mood. He interacts reasonably well with others, but has absented himself from work. The most probable diagnosis is: \nSelect and explain. \nA. Depression, B. Psychogenic headache, C. Adjustment disorder, D. Somatization disorder', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Here, the diagnosis is adjustment disorder. The symptoms are not severe enough to qualify for the diagnosis of depression and there is a clear history of a stressor (diagnosis of leukemia in son). The symptoms of adjustment disorder usually sta within 3 months of the stressor', 'role': 'assistant'}]