The correct answer is D. O.
Blood type is determined by the presence or absence of certain antigens on the surface of red blood cells. Antigens are proteins that the body’s immune system can recognize. If a person’s blood type contains antigens that the body’s immune system does not recognize, the body may attack the red blood cells, causing a serious condition called hemolysis.
Blood type O is the only blood type that does not contain any antigens. This means that people with blood type O can donate blood to people with any blood type, but they can only receive blood from other people with blood type O.
Blood type A and B blood types contain antigens that are not present in blood type O blood. Blood type AB blood contains both A and B antigens.
If a person receives blood that contains antigens that their body does not recognize, their immune system will attack the red blood cells. This can cause a serious condition called hemolysis, which can lead to death.
For this reason, it is important to only receive blood from a person with the same blood type.