Which of these is NOT a blood group?

Correct option is D

The correct answer is (d) C.
· C is not a recognized human blood group. The four main human blood groups are A, B, AB, and O, which are based on the presence or absence of specific antigens on the surface of red blood cells. These blood groups are further categorized into Rh-positive or Rh-negative based on the presence of the Rh factor.
Information Booster:
· A, B, AB, and O Blood Groups: These are part of the ABO blood group system, which is the most important system for blood transfusions.
· Universal Donor: O negative is considered the universal donor, as it can be given to people of any blood type.
· Universal Recipient: AB positive is considered the universal recipient, as individuals with this blood type can receive any ABO blood type.