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': "Safest method of contraception in sickle cell anaemia: \nSelect and explain. \nA. Oral 'Pill', B. IUCD, C. Barrier method, D. Progestin only pill or implant", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]