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': 'Prophylactic forceps in a cardiac diseased patient is used, when head is at station : \nSelect and explain. \nA. 0, B. 1, C. 2, D. -1', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 2', 'role': 'assistant'}]