Correct Answer: Edward Jenner

Solution : The correct answer is Edward Jenner.

Edward Jenner developed the smallpox vaccine. He was an English doctor who is regarded as the founding figure of immunology. Jenner wrote about his first successful smallpox immunisation in a report he published in 1796. He made the hypothesis that cowpox vaccination may shield humans from smallpox after noticing that milkmaids who had previously acquired cowpox did not contract smallpox.