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: Surgery
A person is having HBsAg negative, Anti-HBs positive, Anti HBc positive. Most probable diagnosis is? 
Select and explain. 
A. Immunity due to vaccination of hepatitis B, B. Immunity due to infection of hepatitis B, C. Acute infection of hepatitis B, D. Chronic infection of hepatitis B
B: Immunity due to infection of hepatitis B
Answer: B: Immunity due to infection of hepatitis B 
Explanation: Immunity due to infection of hepatitis B REF: CURRENT Medical Diagnosis & Treatment Chapter 16. Liver, Biliary Tract, & Pancreas Disorders See APPENDIX-28 for "MARKERS OF HEPATITIS-B"