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
[{'content': 'If division of fertilized egg occurs at 4-8th day what kind of monozygotic twin pregnancy will it give rise to- \nSelect and explain. \nA. Diamniotic dichorionic, B. Diamniotic monochorionic, C. Monoamnionic monochorionic, D. Conjoined twins', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans-B', 'role': 'assistant'}]