state gov DSSSB Nursing Officer Mock Test 2024 Nursing Pediatric Nursing

प्रथम पोलिओ लस कोणी विकसित केली?

1
जोनास सालक
2
रॉबर्ट हूके
3
अलेक्झांडर फ्लेमिंग
4
एडवर्ड जेनर
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