This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Most common type of twin pregnancy is- \nSelect and explain. \nA. veex + transverse, B. Both veex, C. Veex + breech, D. Both breech', 'role': 'user'}, {'content': 'Answer: B \nExplanation: <p> Most common type of presentation in twin pregnancy is both twin veex(50%) Reference:DC Dutta&;s textbook of obstetrics,8th edition, page no:243 <\\p>', 'role': 'assistant'}]