This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fertilization and Development of Embryo, Subject name: Anatomy
[{'content': 'Morula is how many ceiled - \nSelect and explain. \nA. 4, B. 8, C. 12, D. 16', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 16 o At about 16 cells stage the blastomeres tightly align by the process of compaction to form a compact ball of cells called morula (mulberry ).o This process of compaction leads to segregation of cells into two groups :Inner cells (inner cell mass)Outer cells (outer ceil mass)o Morula enters uterine cavity 4 days after fertilization.", 'role': 'assistant'}]