A person with an unknown blood group under the ABO system, has suffered significant blood loss in an accident and needs an immediate blood transfusion. His friend who has a valid certificate of his blood type, offers blood donation without delay. What would have been the type of blood group of the donor friend?
Type AB
Type O
Type A
Type B
Individuals with blood group 'O' are known as 'universal donors' because they can donate blood to persons with any other blood group (A, B, AB, or O). In an emergency situation where the recipient's blood group is unknown, Type O blood is the only safe option to prevent antigen-antibody reactions (clumping) .
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