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: Gynaecology & Obstetrics
[{'content': 'Hallmark of Arias - stella reaction is \nSelect and explain. \nA. Pinopods, B. Nuclear enlargement, C. Vacuoles in cytoplasm, D. Nuclear pyknosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Classical hallmark of nuclear enlargement in glandular cells is seen in Arias stella reaction.', 'role': 'assistant'}]