This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatitis, Subject name: Pathology
[{'content': 'A 20-year-old woman presents with a 2-week history of fever, malaise, and brown-colored urine. She recently visited Mexico. Physical examination reveals jaundice, mild hepatomegaly, and tenderness in the right upper quadrant. The serum bilirubin is 7.8 mg/dL, with 60% in the conjugated form. Serum levels of AST and ALT are markedly elevated (400 and 392 U/L, respectively). Serum albumin and immunoglobulin levels are normal. Serum IgM anti-hepatitis A virus (anti-HAV) is positive. IgG anti-hepatitis B surface antigen (anti-HBsAg) antibodies are positive. Anti-hepatitis C virus antibodies are negative.What is the most likely diagnosis? \nSelect and explain. \nA. Acute viral hepatitis A, B. Acute viral hepatitis B, C. Acute viral hepatitis C, D. Autoimmune hepatitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HAV RNA Transmitted by the fecal-oral route and may be contracted by contamination of water and food. Never pursues a chronic course, does not have a carrier state, and provides life-long immunity. IgM anti-HAV is identified in acute infections. -The presence of serum IgG anti-HBsAg indicates prior exposure to hepatitis B virus but does not reflect active disease . -Individuals with chronic hepatitis B do not have detectable anti-HBsAg in their blood. -Acute and chronic hepatitis C are ruled out by the negative serology.', 'role': 'assistant'}]