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Edward jenner discovered

$\begin{array}{1 1}(A)\;\text{Immunization against smallpox}\\(B)\;\text{Vaccination against smallpox}\\(C)\;\text{Vaccination against polio}\\(D)\;\text{Immunization against polio}\end{array} $

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Edward jenner discovered vaccination against smallpox
Hence (B) is the correct answer.
answered Jul 10, 2014 by sreemathi.v
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