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: Social & Preventive Medicine
A village with 10000 population 250 suffered from malaria out of which 50 dead, another 100 suffered from dengue out of which 30 died in 2013 case fatality rate of dengue is ? 
Select and explain. 
A. 40, B. 80, C. 30, D. 70
C: 30
Answer: C: 30 
Explanation: Ans. is 'c' i.e., 30