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: Forensic Medicine
In a case of disputed paternity, father's blood group is A, mother's blood group is B, the child's blood group may be: Karnataka 07 
Select and explain. 
A. A only, B. B only, C. AB only, D. A, AB, B or O
D: A, AB, B or O
Answer: D: A, AB, B or O 
Explanation: Ans. A, AB, B or O