This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrical Anatomy, Subject name: Gynaecology & Obstetrics
Which of the following is a true statement: 
Select and explain. 
A. Placenta is formed at morula stage, B. Implantation takes place on 10th day, C. During initial weeks corpus luteum survival is due to LH, D. Fertilization takes place in ampula
D: Fertilization takes place in ampula
Answer: D: Fertilization takes place in ampula 
Explanation: Ans. (d) Fertilization takes place in ampulaRef.: D.C. Dutta 8th ed. / 32-36, 7th ed. 121-22Option A-Placenta is formed by trophoblast which 1st appear at blastocyst stage, hence option A is wrong.Option B-Implantation takes place on 6th day.Option C-During initial weeks corpus leuteum surviaval is due to HCG, not due to LH.Option D-site of fertilization is ampulla.