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: Medicine
[{'content': 'About chronic hepatitis B , all are true, EXCEPT: \nSelect and explain. \nA. 90 % chance for chronic infection if infected at bih., B. Mild chronic hepatitis B has 5 year survival 97 %, C. Adult infection is usually symptomatic, D. Chronicity if infected in adult age is about 10 %', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Chronic hepatitis B: 1. Infection at bih is clinically silent but carries a 90% chance of chronic infection. 2. Infection in young adulthood is clinically apparent acute hepatitis but a risk of chronicity of only approximately 1%. 3. A 5-year survival rate of 97% for patients with mild chronic hepatitis B, 86% for moderate to severe chronic hepatitis B, and only 55% for patients with chronic hepatitis and postnecrotic cirrhosis. Ref: Harrison, Edition-18, Page-2567.', 'role': 'assistant'}]