A- what is the medical term for yellow discoloration of the sclera and mucous membranes? jaundice b- what disease does duyen have? assume that the desease is caused by dna virus?

A- what is the medical term for yellow discoloration of the sclera and mucous membranes?
jaundice

Your answer is true, it is called jaundice. The yellow discoloration is caused by the buildup of bilirubin which has yellow color too. The yellow discoloration could appear in the sclera, mucose membrane and the skin. The liver is the organ that responsible for the "breakdown" of bilirubin so it is probably damaged in this patient. 

b- what disease does duyen have? assume that the desease is caused by dna virus?
Hepatitis virus

Hepatitis virus will target the liver cells and makes it unable to do its function (one of them is breaking bilirubin). Hepatitis virus is a DNA virus and it has a variety of types. It could be spread by body fluid of the infected patient. Hepatitis A could be spread by food while hepatitis B and C mostly bloodborne.