BANK EPFO SSA Mock Test 2023 General Science Biology Invention and Discoveries

 प्रथम पोलिओ लस ___________ यांनी तयार केली होती.

1
जे सॉल्क
2
एल पाश्चर
3
​जी जे मेंडेल
4
वॉटसन 
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