This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anxiety & Stress, Subject name: Psychiatry
[{'content': 'Fear is due to: \nSelect and explain. \nA. Abnormal experiences of childhood, B. Over conciousness, C. Excess perception of danger, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D ref: Kaplan, 8th/e p. 557-558', 'role': 'assistant'}]