alleryStart learning →Who discovered the major human blood groups in 1900?
AKevin MacKenzie
BKarl Landsteiner
CJanice Haney Carr
DLance Armstrong
Answer & Solution
Correct answer: B. Karl Landsteiner
1. Before 1900, physicians did not understand why death sometimes followed a transfusion.
2. Karl Landsteiner, an Austrian biologist and physician, discovered the major human blood groups in that year.
3. Matching donor and recipient types became possible for the first time, which is what made transfusion safe.
4. The other names belong to a micrograph credit and to a cyclist, so none is connected with blood group discovery.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.6 Blood Typing_
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