This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'The genotype of blood group A would be \nSelect and explain. \nA. AB, B. AO, C. OO, D. BO', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The genotype for a blood group can be AA OR AO blood groups are three genes Ia,Ib,Io Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:155,156,157', 'role': 'assistant'}]