GENERAL KNOWLEDGE

Detailed explanation-1: -Landsteiner in his 17th scientific paper in 1901 reported blood group ABO which was displayed at the beginning with the letters ABC. In 1930, he received the Nobel Prize in Medicine for his discovery.

Detailed explanation-2: -Initially, Landsteiner recognized three different blood types: A, B, and C. The C-blood type was later more commonly called type-O. In 1902, one of Landsteiner’s students found a fourth blood type, AB, which triggered a reaction if introduced into either A or B blood.

Detailed explanation-3: -Karl Landsteiner discovered the four blood groups.