This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
[{'content': 'Persistent preoccupation with serious illness and normal body function is called - \nSelect and explain. \nA. Obsession, B. Somatization, C. Hypochondriasis, D. Conversion disorder', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]