A certain road accident patientwith unknown blood group needsimmediate blood transfusion. His onedoctor friend at once offers hisblood.What was the blood group of thedonor? [2012]

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A certain road accident patientwith unknown blood group needsimmediate blood transfusion. His onedoctor friend at once offers hisblood.What was the blood group of thedonor? [2012]