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: Pathology
Which of the following is also known as australia antigen: September 2006 
Select and explain. 
A. HBsAg, B. HBeAg, C. HBcAg, D. HBV DNA
A: HBsAg
Answer: A: HBsAg 
Explanation: Ans. A: HBsAg HBV was first linked to hepatitis in the 1960s when Australia antigen (later known as HBV surface-antigen) was identified.