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
[{'content': 'Supplementary immunisation services for measles immunisation? \nSelect and explain. \nA. Keep up with > 95% immunised, B. Catch up, C. Follow up, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: WHO Measles Elimination strategy : Catch up, Keep up, Follow up. Catch up: Nationwide, vaccination targeting all children 9 months to 14 years of age, irrespective of history of Measles disease or vaccination status Keep up: Routine services aimed at vaccinating more than 95% of each successive bih coho. Follow up: Subsequent nationwide vaccination campaigns conducted every 2-4 years targeting usually all children born after the catch-up campaign Ref: Park 25th edition Pgno : 161-162', 'role': 'assistant'}]