Which of the following assertions about hepatitis A and hepatitis B contains false information?

Hepatitis A is caused by an RNA virus, whereas hepatitis B is caused by a DNA virus.

Hepatitis A spreads through the feco-oral route, whereas hepatitis B spreads through sexual contact.

Hepatitis A is acute, whereas hepatitis B is acute as well as chronic.

Hepatitis A is called serum hepatitis, whereas hepatitis B is called infectious hepatitis.