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Q.591 : चेचक के टीका की खोज किसने किया था?
(a) लुईस पाश्चर
(b) एडवर्ड जेनर
(c) एल्क्जेंदर फ्लेमिंग
(d) वाटसन एंड क्रिक
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Answer :
एडवर्ड जेनर
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