This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Outer cell mass gives rise to \nSelect and explain. \nA. Embryo proper, B. Trophoblast, C. Syncytiotrophoblast, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It consists of an inner cell mass that is completely surrounded by an outer layer of cells.the second.the cells of the outer layer will later give rise to a structure called trophoblast HUMAN EMBRYOLOGY-INDERBIR SINGH TENTH EDITION-PAGE NO:50', 'role': 'assistant'}]