Karl Landsteiner, along with Alexander Wiener, discovered the Rh factor in 1940. This antigen, present on the surface of red blood cells, determines the Rh-positive or Rh-negative status of blood groups, which is critical for blood transfusions and pregnancy.
| LIST I | LIST II | ||
|---|---|---|---|
| A | Chop wound | I | Axe |
| B | Punctured wound | II | Needle |
| C | Bruises | III | Whip |
| D | Incised wound | IV | Knife |