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: Gynaecology & Obstetrics
[{'content': 'If division of feilized egg occurs at 4-8th day what kind of mono zygotic twin pregnancy will it give rise to : \nSelect and explain. \nA. Diamnionic dichroionic, B. Diamnionic monochorionic, C. Monoamnionic monochorionic, D. Conjoined twins', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Diamnionic monochorionic', 'role': 'assistant'}]