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
A case of acute flaccid paralysis must be observed for how many days for residual weakness - 
Select and explain. 
A. 30 days, B. 42 days, C. 60 days, D. 90 days
C: 60 days
Answer: C: 60 days 
Explanation: - AFP surveillance is done in all children below age of 15 years. - at least 80% of the AFP cases should have a follow up examination of residual paralysis at 60 days after the onset of paralysis. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:204 <\p>