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: Unknown
Father has a blood group B: Mother has AB: Children are not likely to have the following blood group- 
Select and explain. 
A. O, B. A, C. B, D. AB
A: O
Answer: A: O 
Explanation: Ans-ABlood group inheritance by phenotypeBlood group (Parents)OABABOOO or AO or BA or BAO or AO or AO, A, B, or ABA,B orABBO or BO, A, B or ABO or BA, B or ABABA or BA, B or ABA, BorABA, B or AB