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
Persistent preoccupation with serious illness and normal body function is called - 
Select and explain. 
A. Obsession, B. Somatization, C. Hypochondriasis, D. Conversion disorder
C: Hypochondriasis
Answer: C: Hypochondriasis 
Explanation: None