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: Physiology
[{'content': 'Subnuclear cytoplasmic vacualization is seen in which stage of menstural cycle ? \nSelect and explain. \nA. Proliferative phase, B. During mensturation, C. Secretory phase, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., During mensturation", 'role': 'assistant'}]