Which Hepatitis affects the liver?

My father's doctor said that his liver is sick that is why he is losing weight.
My father is scared he might have any type of hepatitis.
Which Hepatitis affects the liver?
Update: Is there a treatment for any of these conditions?
Update 2: If he needs a liver transplant, what are the requirements for a liver transplant?
Does the person need to have same blood type?
5 answers 5