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': 'Which one of the following is the ideal contraceptive for a patient with heart disease: \nSelect and explain. \nA. IUCD, B. Depoprovera, C. Diaphragm, D. Oral contraceptive pills', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]