18. Polio vaccine was developed by
(a) Jonas Salk
(b) Alo Sabin
(C) Ramd
(d) Perkins
![= 1 = 3 = \sqrt{ \\ \frac{ \sqrt[33 \frac{ = 36 = .. < .. {3 > 0 \geqslant = 01}^{?} }{?} \times \frac{?}{?} ]{?} }{?} } 125.x2 = \frac{ \sqrt{ < \sqrt[ < \frac{ \frac{.22. \sqrt[52.]{?} \times \frac{?}{?} }{?} }{?} \sqrt{..} ]{?} } }{?} . < < \frac{33}{?} .2 < \frac{ \frac{ { {4}^{2} }^{2} }{?} }{?} \times \frac{? \\ }{?}](https://tex.z-dn.net/?f=+%3D+1+%3D+3+%3D++%5Csqrt%7B+%5C%5C++%5Cfrac%7B+%5Csqrt%5B33+%5Cfrac%7B+%3D+36+%3D+..+%26lt%3B+..+%7B3+%26gt%3B+0+%5Cgeqslant++%3D+01%7D%5E%7B%3F%7D+%7D%7B%3F%7D++%5Ctimes+%5Cfrac%7B%3F%7D%7B%3F%7D+%5D%7B%3F%7D+%7D%7B%3F%7D+%7D+125.x2+%3D++%5Cfrac%7B+%5Csqrt%7B+%26lt%3B++%5Csqrt%5B+%26lt%3B++%5Cfrac%7B+%5Cfrac%7B.22.+%5Csqrt%5B52.%5D%7B%3F%7D++%5Ctimes+%5Cfrac%7B%3F%7D%7B%3F%7D+%7D%7B%3F%7D+%7D%7B%3F%7D++%5Csqrt%7B..%7D+%5D%7B%3F%7D+%7D+%7D%7B%3F%7D+.+%26lt%3B++%26lt%3B++%5Cfrac%7B33%7D%7B%3F%7D+.2+%26lt%3B++%5Cfrac%7B+%5Cfrac%7B+%7B+%7B4%7D%5E%7B2%7D+%7D%5E%7B2%7D+%7D%7B%3F%7D+%7D%7B%3F%7D++%5Ctimes+%5Cfrac%7B%3F+%5C%5C+%7D%7B%3F%7D+ "= 1 = 3 = \sqrt{ \\ \frac{ \sqrt[33 \frac{ = 36 = .. < .. {3 > 0 \geqslant = 01}^{?} }{?} \times \frac{?}{?} ]{?} }{?} } 125.x2 = \frac{ \sqrt{ < \sqrt[ < \frac{ \frac{.22. \sqrt[52.]{?} \times \frac{?}{?} }{?} }{?} \sqrt{..} ]{?} } }{?} . < < \frac{33}{?} .2 < \frac{ \frac{ { {4}^{2} }^{2} }{?} }{?} \times \frac{? \\ }{?}")
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(a) Jonas Salk
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answer is Jonas Salk..................
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