This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Prevalence of disease will decrease in all of the following scenarios, except: 
Select and explain. 
A. Immigration Of Cases, B. If case-fatality rate is high, C. Lack Of Advanced Diagnostic Services At Centres, D. Advanced Treatment Modalities Are Available
A: Immigration Of Cases
Answer: A: Immigration Of Cases 
Explanation: None