This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disease Causation, Measurements, Milestones, Subject name: Social & Preventive Medicine
If the prevalence is very low as compared to the incidence for a disease, it implies: 
Select and explain. 
A. Disease is very fatal and/or easily curable, B. Disease is non-fatal, C. Calculation of prevalence & incidence is wrong, D. Nothing can be said, as they are independent
A: Disease is very fatal and/or easily curable
Answer: A: Disease is very fatal and/or easily curable 
Explanation: Prevalence = Incidence X Mean duration of the disease (P = I X d) Incidence reflects causal factors Duration reflects the prognostic factors In the given question, prevalence is very low as compared to the incidence for a disease. Thus, d has to be low; duration of the disease can be sho under 2 circumstances: Either disease is very fatal, or Disease is easily curable