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Inventions Competitive Exam: Certification Test 618

Polio MCQs App Download & PDF e-Book - 618

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MCQ: 618

Oral polio drops were invented by

  1. Sir Rudolf Stefen
  2. Sir Albert Sabin
  3. Sir Maurice Hilleman
  4. Sir Edward Jenner
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8th Class Science Test Questions

8th Class Science Quiz with Answers