This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Fate of Inner cell mass in embryo development... \nSelect and explain. \nA. Placenta, B. amniotic membrane, C. Fetus, D. Expelled out of developing embryo by 7 weeks', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cells of blastocyst differentiate into an outer trophoectoderm and inner cell mass. Just before implantation trophoectoderm fuher divided into: Cytotrophoblast & Syncytiotrophoblast Placenta and fetal membrances are derived from trophoectoderm. Inner cell mass helps in the development of embryo proper.', 'role': 'assistant'}]