1.

1. Poliomyelitis or polio is a serious infection. P. It often attacks children paralysing them for life. Q. In the 1950's a vaccine against the disease was introduced. R. Hence it is sometimes called infantile paralysis. S. It is caused by a virus. 6. Since then polio has been eliminated to a great extent.

A. PSRQ
B. SPQR
C. SPRQ
D. PRQS
Answer» D. PRQS


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