Hilary Koprowski who passed away recently was a pioneer in the development of first successful ___:

Hilary Koprowski who passed away recently was a pioneer in the development of first successful ___:
[A]Heart transplant
[B]Oral vaccination for polio
[C]Vaccination for hepatitis B
[D]In-vitro fertilization

Oral vaccination for polio
Dr. Hilary Koprowski, a pioneering virologist who developed the first successful oral vaccination for polio died in April 2013.

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