Edward Jenner extracted fluid from cowpox fusion and injected it into a boy, then exposed the boy to smallpox. The boy did not contract smallpox. How do you appreciate Edward Jenner's daring action?
a) It was reckless and unethical.
b) It was a groundbreaking and successful experiment.
c) It had no scientific basis and was a mere coincidence.
d) It was a cruel and unnecessary procedure.