Civil Services Uttarakhand Combined State Civil/Upper Subordinate Services Examination 2025 General Knowledge Science Technology and Inventions

चेचक के टीके का आविष्कार किसने किया?

1
रॉबर्ट कोच
2
जोनास साल्क
3
एडवर्ड जेनर
4
लुई पाश्चर
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