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': 'Double Monster, fused in pelvic region is called : \nSelect and explain. \nA. Ischiopagus, B. Thoracopagus, C. Syncephalu, D. None of these', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ischiopagus', 'role': 'assistant'}]