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Question 1 of 60

Which vaccine, developed in the 20th century, led to the global eradication of a major infectious disease?

Rationale:
C: Smallpox vaccine. The smallpox vaccine, introduced in the late 18th century and widely implemented in the 20th century, successfully eradicated smallpox, a devastating disease that previously caused widespread mortality and suffering globally. A: Polio vaccine. While the polio vaccine significantly reduced polio cases, it has not completely eradicated the disease, unlike the smallpox vaccine, which achieved total elimination. B: Measles vaccine. The measles vaccine has greatly decreased incidence rates but has not resulted in global eradication, as measles outbreaks still occur in various regions worldwide. D: Chickenpox vaccine. The chickenpox vaccine prevents the disease but does not address a widespread epidemic, and chickenpox remains endemic, failing to achieve the level of eradication seen with smallpox.