This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'A 55 yr old male patient with chronic hepatitis B presents with fatigue. Which of the following codes for DNA polymerase? \nSelect and explain. \nA. S gene, B. X gene, C. Pgene, D. C gene', 'role': 'user'}, {'content': 'Answer: C \nExplanation: HBV Genome has four overlapping genes. They code for: S gene: It codes for surface antigen. C gene: When C region alone is translated: HBcAg is formed. When translation begins from Pre C region, HBeAg is formed. P gene: Codes for DNA polymerase. X gene: Codes for a non-paiculate protein HBxAg Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition', 'role': 'assistant'}]