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
Definition of measles elimination - 
Select and explain. 
A. < 1/1000, B. < 1/10000, C. < 1/100000, D. < 1/100
C: < 1/100000
Answer: C: < 1/100000 
Explanation: WHO defines elimination of measles as the absence of endemic measles for a period of > 12 months in the presence of adequate surveillance.
One indicator of measles elimination is a sustained measles incidence < 1/100, 000 population.
In 2005, the World Health Assembly set a goal of achieving a 90% reduction in global measles mortality by 2010 as compared with level in 2000.