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
Test tube baby is produced by: 
Select and explain. 
A. 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
B: Sperm and ovum are fertilized in test tube and implanted
Answer: B: Sperm and ovum are fertilized in test tube and implanted 
Explanation: None