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: Anatomy
[{'content': 'Embryo proper is derived from \nSelect and explain. \nA. Cytotrophoblast, B. Inner cell mass, C. Syncytotrophoblast, D. Amniogenic cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Outer cell mass forms trophoblast.\nInner cell mass forms embryoblast.', 'role': 'assistant'}]