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': "IUCD with highest incidence of ectopic pregnancy is : \nSelect and explain. \nA. Lippe's loop, B. Copper T, C. Progestase, D. All have equal incidence", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Progestase', 'role': 'assistant'}]