This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
A baby's blood group was determined as O Rh negative.Select the blood group the baby's mother or fatherwill not have. 
Select and explain. 
A. A, Rh Positive, B. B,Rh Positive., C. AB,Rh Negative, D. O, Rh positive
C: AB,Rh Negative
Answer: C: AB,Rh Negative 
Explanation: . AB,Rh Negative