Answer:
All of these answers are correct.
Explanation:
Epidemiologists studies the disease in a particular population. They are concern with the type of disease, disease outbreak, causes and symptoms of the disease.
The real or artifactual disease can be distinguished by epidemiologists by increased interest in identifying the disease. The advances in the ability to identify the disease and change in the disease’s definition before the change in distribution also determines whether disease is real or artifactual.
Thus, the correct answer is option (C).