Hepatitis C is an infectious disease of the liver and if it is not treated with medication and diet can have a very poor outcome.
Scarlet fever is an infectious disease that occurs as a result of infection by bacteria. Typical is the onset of rash, nausea, headache.
Malaria is a life-threatening, contagious disease and is transmitted by biting the infected mosquito.
All these diseases have very visible symptoms, and in two out of three, if not treated, they can have devastating consequences.
Post traumatic stress disorder may or may not be a visible disease. It has psychic consequences that can have a long-term effect. Usually he appears in soldiers who survived the war, watching all the horrors of killing. It does not have to be visible because it is possible to withdraw itself and most often was not treated before. The soldiers suffered from this syndrome especially after the war in Vietnam, although it is present with former soldiers after any war.
The answer is: C.
