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
True about oral polio vaccine: 
Select and explain. 
A. Poliomyelitis in recipients, B. Poliomyelitis in contact of recipient, C. Guillein Barre syndrome, D. Vomiting and fever
A: Poliomyelitis in recipients
Answer: A: Poliomyelitis in recipients 
Explanation: OPV has a rare complication of Vaccine associated paralytic Poliomyelitis (VAPP)
In vaccines: 1 in 1 million
In Close contacts of vaccines: 1 in 5 million