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': 'Absolute contra -- indication of Norplant : \nSelect and explain. \nA. Acute thrombophiebitis, B. Hypeension, C. Diabetes mellitus, D. Hypercholesterolemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Acute thrombophiebitis', 'role': 'assistant'}]