रक्त समूह 'AB' वाला व्यक्ति किस रक्त समूह से रक्त प्राप्त कर सकता है?

Which blood group is known as the Universal Donor?

Antibodies related to the ABO blood group system are found in the:

If a patient needs an emergency blood transfusion and their blood group is unknown, which blood type should be given?