This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, 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 define elimination of measles as the absence of endemic measles for a period of grater than 12 months in the presence of adequate surveillance measles incidence less than 1/100,000 population. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 21ST EDITION. - 137