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': 'The best contraceptive method in a patient with hea disease is : \nSelect and explain. \nA. Double barrier, B. IUCD, C. Tubectomy, D. Oral pills', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Double barrier', 'role': 'assistant'}]