This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Pathology
[{'content': "A baby's blood group was determined as O negative. Which of the following blood group the baby's mother or father will not have? \nSelect and explain. \nA. A Positive, B. B Positive, C. AB Negative, D. O positive", 'role': 'user'}, {'content': "Answer: C \nExplanation: Baby's mother or father will not have AB blood gp. Because if either of them will have AB then progeny can not have O blood group. AB * AO - AA, AO,AB,BO (no O gp possible) AB *AA -AA,AA,AB,AB (no O gp possible)", 'role': 'assistant'}]