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': 'Test tube baby is produced by: \nSelect and explain. \nA. Sperm and ovum are directly implanted into fallopian tube, B. Sperm and ovum are fertilized in test tube and implanted, C. Fetus is grown in test tube, D. Only sperm is transferred', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]