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
AlI except one are true for hepatitis B 
Select and explain. 
A. Vertical transmission more important than horizontal, B. Age of onset determines prognosis, C. Period of communicability lasts several months, D. Virus can be found in blood 1 month before jaundice
A: Vertical transmission more important than horizontal
Answer: A: Vertical transmission more important than horizontal 
Explanation: None