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: Pediatrics
Polio virus infection can result in all except ? 
Select and explain. 
A. Anterior horn cell damage, B. Autonomic involvement, C. respiratory involvement, D. Paralysis in > 70% of cases
D: Paralysis in > 70% of cases
Answer: D: Paralysis in > 70% of cases 
Explanation: Ans. is 'd' i.e., Paralysis in > 70 of cases o Poliovirus selectively damage motor and autonomic nervous system. o Most commonly affected areas are the anterior horn of the spinal cord, vestibular and cranial nerve nuclei and vital centres in the medulla and vermis, and nuclei in the roof of cerebellum. o When respiratory centers are involved the respiration becomes shallow and irregular. o Areas which are usually not affected White matter of spinal cord, Cerebellar hemisphere, Nonmotor pa of cerebral coex. o Paralytic polio is seen in less than 1% of polio infections.