This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Chronic hepatitis C infection is associated with which psychological illness that may worsen with IF-a treatment? 
Select and explain. 
A. OCD, B. PTSD, C. Depression, D. Schizophrenia
C: Depression
Answer: C: Depression 
Explanation: The relationship between depression and disease progression is multifactorial and likely to involve psychological and social factors, alterations in immune function, and central nervous system disease. Chronic hepatitis C infection is associated with depression, which may worsen with interferon-a treatment.